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Can I bleed the master cylinder using the car? #4584927
11/25/17 10:13 PM
11/25/17 10:13 PM
Joined: Jan 2017
Posts: 316
NJ
JLawrence08648 Offline OP
JLawrence08648  Offline OP
Joined: Jan 2017
Posts: 316
NJ
I need to replace my master cylinder.

The instructions say to bench bleed by filling and using tubing pumping the brake fluid back into the master cylinder by pushing the rod with your hand.

I've always bled it on the car. I bled it the same way, disconnectimg tje brake lines and hooking up tubing to re-use the new brake fluid by funneling back into the master cylinder, same as in a vise.

I find it easier for my wife to pump the brake pedal and me watch the "operation" under the hood.

Then when bled, I hook up the lines and do the normal bleeding of each wheel until the brake fluid comes clear in a clear soda bottle with a hose attached from the bleeder screw.

Anything wrong with this method?

Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4584931
11/25/17 10:18 PM
11/25/17 10:18 PM
Joined: Jun 2005
Posts: 11,337
Santa Barbara, CA
bdcardinal Online content
bdcardinal  Online Content
Joined: Jun 2005
Posts: 11,337
Santa Barbara, CA
Nothing wrong with your method. Supposedly bench bleeding became popular when a lot of cars had the master cylinders mounted low on the frame.

Just take care to not get brake fluid on the paint and if you think you might have run a bunch of water all over the area, obviously with the master cylinder cap on.

Last edited by bdcardinal; 11/25/17 10:19 PM.

2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4584936
11/25/17 10:20 PM
11/25/17 10:20 PM
Joined: Oct 2009
Posts: 384
California
Billbert Offline
Billbert  Offline
Joined: Oct 2009
Posts: 384
California
It is Not recommended to do it that way. There is little feeling for what is going on, and you can, under some circumstances ruin the rubber cups inside the master cyl. Bench bleed ing is required prior to installation.


If you think you can, or if you think you can't, You are probably right.

Auto Instructor / ASE Master Tech
Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4584958
11/25/17 10:34 PM
11/25/17 10:34 PM
Joined: Jun 2003
Posts: 33,109
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,109
ME
If the part says you have to, you have to. They wouldn't spend the nickle on that plastic tube if you didn't need it.

Most likely your car's MC tilts backward at the firewall and there'd be no way to get at the air bubble on the far forward side of your particular unit.

Other MCs you've dealt with have had a more vertical firewall.

Some MCs are tapped for a line at the far forward end; yours does not sound like one.

IOW, just follow the directions. laugh

Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4584986
11/25/17 11:04 PM
11/25/17 11:04 PM
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
Until the innards are immersed in brake fluid, they are dry and stiff. A bench bleed will ease the rubber into duty. Here's a tip, All the hydraulic parts come with instructions. Reading them a few times will help you get the idea, if you've never played with one before. grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4585011
11/25/17 11:40 PM
11/25/17 11:40 PM
Joined: May 2010
Posts: 9,060
North Carolina
spasm3 Online content
spasm3  Online Content
Joined: May 2010
Posts: 9,060
North Carolina
I bench bleed. I do it to make sure the MC goes full stroke. Can you be sure the brake pedal makes the MC go all the way? Also i can watch and see when the air bubbles stop.


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: Can I bleed the master cylinder using the car? [Re: JLawrence08648] #4585079
11/26/17 01:14 AM
11/26/17 01:14 AM
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,530
Marshfield , MA
I rig an air lock, a little brake fluid in a hot sauce bottle and 2' of clear tubing sized to make a tight fit at the bleeder. Once you don't see bubbles,you move on. It is cheap and you don't need help. If you can't bleed, it is because the system is sucking air some where. Now you have to get a gravity bleed running. A system won't gravity bleed if it isn't air tight.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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