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2019 GM 1500 trucks brake info, no more master cyl. #4850341
08/25/18 08:01 AM
08/25/18 08:01 AM
Joined: Dec 2002
Posts: 1,733
North Carolina
Rat407 Offline OP
Rat407  Offline OP

Joined: Dec 2002
Posts: 1,733
North Carolina
Thought this was interesting. Looks like vehicle complexity is getting crazy.

Brake System Overview
Note: ZF TRW’s Integrated Brake Control is a 1-piece module that eliminates the master cylinder, vacuum pump and associated hoses while incorporating electronic stability control, traction control and an electric motor to push hydraulic fluid to brakes at all four corners. The module is 13 lbs. (6 kg) lighter than the total weight of a conventional system and only requires about half the packaging space underhood.

The vehicles are equipped with a ZF TRW Integrated Brake Control (IBC), also known as a Brake System Control Module. The IBC is an electromechanical device that interprets and converts driver input and provides a corresponding hydraulic pressure output to activate a standard brake system according to driver demand. In an event of no electrical energy or failure condition the driver’s input is mechanically converted to a hydraulic pressure output.
Use DOT 4 Hydraulic Brake Fluid (GM Part No. 19299570, in Canada 19299571).
Electrical Component Operation

The Body Control Module (BCM) monitors the brake pedal position sensor signal when the brake pedal is applied and sends a high speed serial data message to the Brake System Control Module indicating the brake pedal position. The following electrical components are used:
Wheel Speed Sensors: Equipped with unique directional wheel speed sensors that can detect wheel direction as well as zero wheel speed. The wheel speed sensors are Active sensors that receive a 12 V power supply from the Brake System Control Module and returns an output signal to the module. As the wheel spins, the wheel speed sensor sends the Brake System Control Module a DC square wave signal. The Brake System Control Module uses the frequency of the square wave signal to calculate the wheel speed.
Multi-Axis Acceleration Sensor: The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, internal to the inflatable restraint sensing and diagnostic module. The Brake System Control Module receives serial data message inputs from the three sensors and activates Stability Control and Hill Hold Start Assist functions depending on multi-axis acceleration sensor input.

Multifunction Switch: The traction control switch is a multifunction momentary switch. The traction control and stability control are manually disabled or enabled by pressing the traction control switch.
Steering Wheel Angle Sensor: The Brake System Control Module receives serial data message inputs from the steering angle sensor. The steering wheel angle sensor signal is used to calculate the intended driving direction. The sensor is an internal part of the power steering gear.

Transmission Control Module: The Brake System Control Module receives high speed serial data message inputs from the transmission control module indicating the gear position of the transmission for Hill Start Assist and Hill Hold functions.

Vehicle Brake Enhancement Systems
Depending on options, the following vehicle brake enhancement systems are provided:
Power-Up-Self Test: The Brake System Control Module performs the first phase of the power-up-self test when the ignition is first turned ON. This phase consists of internal testing of the Brake System Control Module and electrical tests of system sensors and circuits.
Antilock Brake system : ABS provides the active control/modulation of brake fluid hydraulic pressure to the front and/or rear brake corner subsystems (brake torque control) to preclude wheel lock-up and enhance tire-to-road longitudinal braking traction. Avoidance of wheel lock-up provides the driver with the ability to maintain vehicle stability and steerability and minimizes vehicle stopping distance.
Brake Assist: Brake Assist provides additional brake pressure over the pressure provided by the conventional brake apply system.
Panic Brake Assist: Panic Brake Assist will apply the brakes more quickly when a panic brake situation is determined. Panic Brake Assist detects that the driver intent is to stop the vehicle as quickly as possible, but the driver does not apply sufficient brake pressure to do so. The feature will detect the driver intent then actively apply brake pressure to maximum pressure, activating the ABS system and stopping the vehicle as quickly as possible.

Hydraulic Fade Compensation: Based on a brake disc/pad temperature estimate, driver applied master cylinder pressure and vehicle deceleration rate, Hydraulic Fade Compensation will increase brake system pressure above driver applied brake pressure when the brake system determines a gross fade condition.

Rear Brake Boost: Rear Brake Boost provides rear hydraulic brake assist to ensure that all four corners are achieving maximum braking during ABS. When vehicle loading is heavily rear axle biased the rear brakes may not utilize all of the available road adhesion. Rear Brake Boost will provide additional pressure to the rear brakes when the front brakes ABS are activated and the rear wheels have low slip.
Electronic Pre-Fill: Electronic Pre-Fill is used to reduce the brake response time when the driver quickly releases the accelerator pedal. This is also used to support the use of low drag calipers.


2002 Silverado 5.3 0w-20 AMSOIL®
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850364
08/25/18 08:29 AM
08/25/18 08:29 AM
Joined: Jan 2015
Posts: 1,171
missouri
ragtoplvr Offline
ragtoplvr  Offline

Joined: Jan 2015
Posts: 1,171
missouri
Who boy. They have been working towards this for a long time. There have been lots electric power assisted brakes since 2000. for example my 2002 BMW motorcycle had power assisted full anti lock brakes, I personally had no problems but many did. That system did have unassisted back up. The replacement abs module is over 2k so many got converted to normal brakes. That sounds like the system here.

If I had one I would carefully and completely flush all brake fluid every 2 years minimum. Brake fluids do differ in anti-corrosion additives. I would use only premium fluids, and GM fluid is very good.

It is possible someone like Module masters will learn how to rebuild them. You can hope.

Rod

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850386
08/25/18 08:49 AM
08/25/18 08:49 AM
Joined: Dec 2006
Posts: 8,537
Illinois
mrsilv04 Offline
mrsilv04  Offline

Joined: Dec 2006
Posts: 8,537
Illinois
Sounds nice and expensive to work on. A plan to keep the dealer's service department raking in the cash?

And just wait until it starts giving problems... after the warranty expires.

I just can't wait.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850390
08/25/18 08:54 AM
08/25/18 08:54 AM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline

Joined: May 2012
Posts: 1,406
Georgia
Chrysler works basically the same way, they just haven't removed the master cylinder yet. It is mostly there just for the pedal feel.

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850410
08/25/18 09:13 AM
08/25/18 09:13 AM
Joined: Sep 2015
Posts: 1,940
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,940
USA
Originally Posted By: Rat407
In an event of no electrical energy or failure condition the driver’s input is mechanically converted to a hydraulic pressure output.

How would that work without some sort of cylinder?

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850422
08/25/18 09:23 AM
08/25/18 09:23 AM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline

Joined: May 2012
Posts: 1,406
Georgia
Probably with an accumulator, but that would only allow temporary braking.

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: ragtoplvr] #4850450
08/25/18 09:58 AM
08/25/18 09:58 AM
Joined: Jan 2017
Posts: 3,023
VW Fanboy Island
maxdustington Online content
maxdustington  Online Content

Joined: Jan 2017
Posts: 3,023
VW Fanboy Island
Originally Posted By: ragtoplvr
The replacement abs module is over 2k so many got converted to normal brakes. That sounds like the system here.
The system is very advanced, and has a lot of cool features to increase safety and performance, but ABS pumps are super expensive, and with this MC-less braking system, you are going to tack on another $2000+ module.

Pretty sweet though, I wonder if you will be able to mod it to access over 100% braking power?


03 Jetta AWP/09A 210k kms
Edge 0W40 + Mann 719/30
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850478
08/25/18 10:28 AM
08/25/18 10:28 AM
Joined: Nov 2006
Posts: 22,012
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 22,012
MA, Mittelfranken.de
As this system ages it sounds like it will be a nightmare. In the rust belt I anticipate lots of failures around the 5 yr mark, just too much to go wrong. It will be an absolute bugger to diagnose and repair if its anything more than the scan tool can display eg wiring to a sensor.
Going through that that now with a 2011 Dodge Caliber no crank situation, lots and lots wiring issues all over the place, 6 hrs in and no end in sight.


ASE L1, Master. Deutsch Meisterbrief.
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Trav] #4850504
08/25/18 10:58 AM
08/25/18 10:58 AM
Joined: Oct 2014
Posts: 13,807
Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,807
Idaho
Originally Posted By: Trav
As this system ages it sounds like it will be a nightmare. In the rust belt I anticipate lots of failures around the 5 yr mark, just too much to go wrong. It will be an absolute bugger to diagnose and repair if its anything more than the scan tool can display eg wiring to a sensor.
Going through that that now with a 2011 Dodge Caliber no crank situation, lots and lots wiring issues all over the place, 6 hrs in and no end in sight.
Well spoken by the master !!!


2015 F150 2.7
2018 F350 6.2
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850523
08/25/18 11:19 AM
08/25/18 11:19 AM
Joined: Jul 2005
Posts: 32,478
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 32,478
NY
Sounds cool, and expensive. Since this is probably another technology that will be hard to avoid in the not so distant future I'll let the early adopters iron out the bugs, and report back. By the time I'm ready for another new vehicle the system should be perfected, and hopefully an improvement over what I currently have.


God Bless Our Troops

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850545
08/25/18 11:46 AM
08/25/18 11:46 AM
Joined: Dec 2016
Posts: 471
Indiana
5AcresAndAFool Offline
5AcresAndAFool  Offline

Joined: Dec 2016
Posts: 471
Indiana
Well if its going to get screwed up, GM will be the ones to do it.

With that being said I remember all the apocalyptic predictions back when "Fuel Infection" came out.

IIRC the Fox Body LSC had an ABS unit that used an accumulator and was an expensive system to repair back in the 90s/early 2000s.


The thing about these redneck status symbol pickup trucks being sold nowadays, the original owner isn't likely going to have it in 10 years, let alone 20. GM, nor any other manufacturer does not care about repair cost or serviceability down the line. Its cheaper, lighter and quicker for them to assemble.

And as always, if there is a need for parts support down the road there will be a company willing to step in and provide that support.

(I know that there are some trucks used for work, but lets be honest here)

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850575
08/25/18 12:31 PM
08/25/18 12:31 PM
Joined: Dec 2014
Posts: 1,692
'murica
Ethan1 Offline
Ethan1  Offline

Joined: Dec 2014
Posts: 1,692
'murica
Trav is exactly right. I’ll add this: with automakers now wanting to build cars using off-the-shelf components and systems like this, we’re going to see an increase in industry-wide recalls (e.g. Takata’s recent debacle).

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850582
08/25/18 12:35 PM
08/25/18 12:35 PM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline

Joined: Oct 2011
Posts: 5,091
USA
I laugh when GM buyers will justify their (usually) Chevrolet truck purchase with:

"I always buy a Chevy because they change the least of the big 3"

"I buy Chevy because its the easiest to work on..least complicated"

"I buy a Chevy because they really haven't changed much since 1955..."

Wait until some old [censored] finds out 4 or 5 years from now what its going to cost to get his brakes back....and wait until 7-8 years out when GM obsoletes the part making it non-obtainum....LOL

Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850584
08/25/18 12:37 PM
08/25/18 12:37 PM
Joined: Apr 2017
Posts: 1,962
San Rafael, CA
dogememe Offline
dogememe  Offline

Joined: Apr 2017
Posts: 1,962
San Rafael, CA
Sounds like a nightmare down the road but very interesting and thanks for sharing!


2010 Ford Escape 2.5 ~96K Miles
Valvoline 5W-20 from Valvoline Instant Oil Change.
Re: 2019 GM 1500 trucks brake info, no more master cyl. [Re: Rat407] #4850609
08/25/18 01:02 PM
08/25/18 01:02 PM
Joined: Aug 2003
Posts: 11,652
Buffalo, NY
JTK Offline
JTK  Offline

Joined: Aug 2003
Posts: 11,652
Buffalo, NY
Diagnosing and repairing? The way I see it, this will be like an ABS module. If it doesn't work, it gets replaced at great expense.

You had to figure it was a matter of time before mechanical brakes were replaced by "brake by wire". Easier for all the computer controlled safety systems buyers like.


2017 Ram 1500 4x4, 3.6L.
2016 Nissan Quest SV (Babe magnet IV)
2015 Nissan Versa 1.6 S
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