Another brake problem
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
That would point to a bad booster. With engine off push the brake pedal a few times to fill the booster with air, does the pedal now return without having to lift it?
Posting Guru
Joined: Mar 2007
Posts: 1,191
Likes: 1
Booster? maybe ... I thought the booster used vacuum to help when pressing the peddle not returning it.
My thoughts came from the memory of the last time I had to bench blead a Mastercylinder. Boy that was a **** to push the piston in...
WHo knows?
My thoughts came from the memory of the last time I had to bench blead a Mastercylinder. Boy that was a **** to push the piston in...
WHo knows?
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Postmaster
Joined: Nov 2008
Posts: 2,851
Likes: 3
From: Buckley, WA
I just replaced the booster and maybe when I put the master cylinder back on could I have done it wrong somehow?
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Post Fiend
Joined: Jan 2005
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And the master cylinder just bolts to the booster so cannot be fitted wrong.
So it could be sticking master cylinder piston, broken piston return spring. Had it been the booster it could have been stuck air valve or broken air valve spring, faulty check valve.
So looking more like the master cylinder?
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Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
Sounds like you have a sticking caliper or a bad flexi brake hose. However that would not cause the pedal return problem. And as it is only the one brake it is not a master cylinder problem.
Posting Guru
Joined: Mar 2007
Posts: 1,191
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When you pick the pedal up with your feet, or foot, or hand. Is there long pedal travel before you get good brake??
Or are the brakes being applied as normal
If there is a long pedal travel when peddle is pulled up,
Heres the problem with the pedal... It is common so.
When you replaced the booster, you should have got the booster cylinder combo. The adjustment between the booster and the cylinder has to be perfect. Your sounds like it is off.
I know enough to get the combo. It may also be the problem with the right brakes hanging up. You have to much space between the booster and the M-cylinder. The pedal stays at the bottom, because that is hwere your M-cylinder will only push it to, when you do push the brakes down, it only cycles the M-cylinder half way at the most. Oil isnt releiving.
Thats My Bet... You didnt have th eproblem before right??? just a hard pedal I am assuming causing the booster to be replaced
Or are the brakes being applied as normal
If there is a long pedal travel when peddle is pulled up,
Heres the problem with the pedal... It is common so.
When you replaced the booster, you should have got the booster cylinder combo. The adjustment between the booster and the cylinder has to be perfect. Your sounds like it is off.
I know enough to get the combo. It may also be the problem with the right brakes hanging up. You have to much space between the booster and the M-cylinder. The pedal stays at the bottom, because that is hwere your M-cylinder will only push it to, when you do push the brakes down, it only cycles the M-cylinder half way at the most. Oil isnt releiving.
Thats My Bet... You didnt have th eproblem before right??? just a hard pedal I am assuming causing the booster to be replaced
Post Fiend
Joined: Jan 2005
Posts: 8,402
Likes: 10
You have got to try to narrow the problem down. Unscrew the nuts holding the master cylinder to the booster and without undoing the pipes slide the master cylinder forward. Without starting the engine does the pedal now return after pushing it down to about where you were getting a brake? If it does not then the problem is in the pedal pivot or the pedal return spring or stiff bushing in the pedal to actuating rod or interferance where the rod goes thru the firewall.
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