OK GUYS, NEED HELP

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

ok my car still isnt on the road yet, the brakes are still getting fixed! ok after new wheel cylinders, reco master cyl, new brake hoses the car still has the same FKN PROBLEM! when the brakes are applied its like pushing against cement, and the rears lock up! the lines have been air compressed for any blockages the mechanic dude doesnt know wat the fk it is, anyone have any ideas?

Stock TE · backyard mechanic Joined: 12 Mar 2002 Posts: 853

Sounds like the booster is shagged, and the booster only works on the front doesnt it?

tassiete · tinkerer Joined: 11 Nov 2002 Posts: 57

brake booster?have you changed it,its the only thing left.sounds like that is what it is if the peddle is like cement

HOP_A_LONG · tinkerer Joined: 27 Aug 2003 Posts: 274

could be

Rear brakes
1) your proportioning valve isn't working or incorrectly adjusted.
2) Rooted mastercylinder, which you fixed so don't worry.

Hard Pedal
1) buggered linkages or dry linkages.
2) booster buggered.
3) check valve or vacuum line to booster buggered
4) restricted flexible hose

OF COURSE THE BOOSTER WORKS ON THE BACK BRAKES!

Hope this helped
HOP-A-LONG

GROOV3 · petrol head Joined: 04 Oct 2001 Posts: 3682

my mate had the same problem
he even got a new master cylinder and yeah it was hte small valve that seperates the fronts from the back had stuffed up so only the back brakes were comming on

was the reco master fully reconed or just the seals

Stock TE · backyard mechanic Joined: 12 Mar 2002 Posts: 853

Doh, wasnt thinking. Just fix the booster first and the problem might go away.

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

thanx for the info guys, i will ring the mechanic and see wat he thinks. the flex hoses have been replaced.

S N 3 A K Y · tinkerer Joined: 18 Jul 2003 Posts: 153

Agree on the booster theory, i also had a mate with a VH that had the same symptoms and it was a fuggered diaphram in the booster.
Maybe it's time to switch mechanics or have a second one for a 2nd opinion, he should have narrowed it down at least through mechanical logic.

S N 3 A K Y

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

he figured it mite be the booster thats making the brakes so stiff, but thats got nothin to do with the rears locking

S N 3 A K Y · tinkerer Joined: 18 Jul 2003 Posts: 153

When you replaced the various brake components, where the rear wheel cylinders shagged ? If they were leaking any fluid, it may have seeped onto the brake linings. This can cause the lining to become 'gummy' and lock up when the brakes are applied.
What are the fronts like when you brake ? Are they normal or are they weaker, like the symptoms of bias being out ?
Depending on exactly how the booster is shagged (may be more than one problem with it) it may be causing a percentage of the locking rears problem.
We're trying to do the best we can to help you out, we've at least given you an avenue to start with from past experience.

S N 3 A K Y

PinkBitz · petrol head Joined: 13 Apr 2002 Posts: 1594

yeh thanx dude for the info, the fronts dont feel like their working at all, just the rears lock up, and the linings are covered in brake fluid. great info, keep it coming