Recent Topics
Fast Food Specials Dissapeared
by 007 - 04/08/20 04:17 PM
Amber Alerts at 5am
by rekit - 04/08/20 03:16 PM
MC FL-910S cut open
by kstanf150 - 04/08/20 03:12 PM
Cartridge Weight Question
by Gebo - 04/08/20 02:54 PM
Auto insurance rate cut
by Wolf359 - 04/08/20 02:18 PM
Do you "correct" your service technician or not?
by SevenBizzos - 04/08/20 02:07 PM
How to keep glasses from fogging up?
by Chris142 - 04/08/20 01:58 PM
1.6 EB ,RL 5w20,18175 miles OCI,TAN>TBN
by ovidiu - 04/08/20 01:02 PM
cut ADBV in Mobil1 oil filter
by RavenTai - 04/08/20 12:55 PM
Oil shopping USA vs France
by M119 - 04/08/20 11:50 AM
Blackstone labs... open??
by researcher - 04/08/20 11:41 AM
Hyundai 2.4 Engine Issues
by Hallj49803 - 04/08/20 11:36 AM
Do old style centrifugal filters do anything?
by atikovi - 04/08/20 11:34 AM
NAPA oil deals
by Oildudeny - 04/08/20 11:17 AM
Oil weight spec thinning over time?
by MontePrix28 - 04/08/20 10:12 AM
High Performance Lubricants PDS
by High Performance Lubricants - 04/08/20 10:11 AM
13 Hyundai Sonata 24 vs 12 Jetta 2.0 TDI
by Hallj49803 - 04/08/20 10:09 AM
Mustang 4.6L spark plug change
by kstanf150 - 04/08/20 10:03 AM
Cutting Cable-Roku?
by PontiacHO - 04/08/20 09:59 AM
Newest Members
LMVLS1, Jotorobi, jhoffy22, EcoBoosted, mmich187
71126 Registered Users
Who's Online Now
103 registered members (53' Stude, 2009Edge, 007, 762fermeandyou, AC1DD, 2015_PSD, 3 invisible), 2,696 guests, and 17 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics303,776
Posts5,241,727
Members71,126
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Bleed Master Cylinder Or Not When Flushing System? #5358895 02/24/20 12:52 PM
Joined: Mar 2011
Posts: 627
F
Fitz98 Offline OP
OP Offline
F
Joined: Mar 2011
Posts: 627
I changed a brake hose and caliper on my Expedition and accidentally emptied master cylinder during repair. I plan to flush the old fluid from all 4 of my brake lines, so my question is whether I need to remove the lines from the master cylinder first to bleed the master cylinder, or if it will bleed itself while I am pushing the old fluid from the lines. I plan to gravity bleed the front brake line and caliper that I replaced first (After re-filling the master cylinder).

Re: Bleed Master Cylinder Or Not When Flushing System? [Re: Fitz98] #5358928 02/24/20 01:25 PM
Joined: Jan 2010
Posts: 3,453
J
JeffKeryk Offline
Offline
J
Joined: Jan 2010
Posts: 3,453
The master will be bled when you bleed the lines, buy why push that air all the way through?
I would bench bleed it, unless you have a power bleeder which makes things easy.
FYI, using a Motive Bleeder was the only way I was able to get a pedal in C3 Corvettes.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Bleed Master Cylinder Or Not When Flushing System? [Re: Fitz98] #5358941 02/24/20 01:39 PM
Joined: Mar 2011
Posts: 627
F
Fitz98 Offline OP
OP Offline
F
Joined: Mar 2011
Posts: 627
The line and caliper I replaced was passenger front. I saw one video where the person used a clear hose from the front caliper back into the master cylinder reservoir and pumped brakes until all air was pushed out. Makes sense to me in theory. Any reason this would not work?
Then I could bleed the rest of the lines.

Re: Bleed Master Cylinder Or Not When Flushing System? [Re: Fitz98] #5358948 02/24/20 01:45 PM
Joined: Dec 2018
Posts: 103
A
A_User55555 Online Content
Online Content
A
Joined: Dec 2018
Posts: 103
Originally Posted by Fitz98
The line and caliper I replaced was passenger front. I saw one video where the person used a clear hose from the front caliper back into the master cylinder reservoir and pumped brakes until all air was pushed out. Makes sense to me in theory. Any reason this would not work?
Then I could bleed the rest of the lines.


In some cars, the master cylinder is angled upward. So some air can get trapped in the tip of the master cylinder. You'd have to remove the master cylinder to bleed it properly.


2011 Cadillac DTS. No the headgaskets have not blown.....
5W-30 Valvoline Full Synthetic with a Purloator Boss PBL25288 Filter
Re: Bleed Master Cylinder Or Not When Flushing System? [Re: Fitz98] #5358980 02/24/20 02:26 PM
Joined: Sep 2015
Posts: 2,526
M
mk378 Online Content
Online Content
M
Joined: Sep 2015
Posts: 2,526
After you've had all the fluid run out of the reservoir, you're almost certainly going to need to bleed all 4 wheels anyway, best to just do that from the start.

It isn't necessary to bench bleed master cylinder except when installing a new one that has absolutely no fluid inside.

Best to never reuse brake fluid that comes out. Brake fluid is cheap compared to parts damaged by contaminated fluid.

Last edited by mk378; 02/24/20 02:27 PM.
Re: Bleed Master Cylinder Or Not When Flushing System? [Re: mk378] #5359063 02/24/20 04:00 PM
Joined: Mar 2011
Posts: 627
F
Fitz98 Offline OP
OP Offline
F
Joined: Mar 2011
Posts: 627
Thanks,
I bled master cylinder on truck into a bottle to get rid of air and old fluid. Will bleed air from replaced front calipers and lines first, then go to rear wheels and then come back to front passenger side and finish drivers front. That should get all old fluid out and air. Master cylinder is on firewall drivers side.

Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™