1.9 Gti - Rear Wheel Lockup (N/s Only)

[kenp 3]

Whilst road testing our Pug over the weekend, I tried some brake tests and discovered the n/s rear is locking up.

 

I'm thinking compensator (although I did replace these about 5 years ago) rather than a caliper problem although we do hav on new an one old caliper on the back. Ironically at the last MOT it was the new caliper that was showing low effort.

[Strictly_Derv 34]

Could it be the tyres? I know when I've had a cheapy spare on it would lock up first...

 

Just noticed your about 5minutes from where I live in South Harting.

Edited December 6, 2011 by Strictly_Derv

[welshpug 1,655]

could be that the o/s isnt getting enough fluid due to the compensator, its not unusual for a 205 to lock the rears under braking.

 

give the system a bleed and you might find fluid comes out far easier from one than the other, the pressure required to bleed is quite minimal so the pressure limiter should not have an effect.

[Strictly_Derv 34]

could be that the o/s isnt getting enough fluid due to the compensator, its not unusual for a 205 to lock the rears under braking.

 

give the system a bleed and you might find fluid comes out far easier from one than the other, the pressure required to bleed is quite minimal so the pressure limiter should not have an effect.

 

 

When I had Pirrelli P600's at the rear it locked up at the rear under hard braking which was pretty scary at times.

[Anthony 1,002]

could be that the o/s isnt getting enough fluid due to the compensator, its not unusual for a 205 to lock the rears under braking.

I might be misunderstanding what you're trying to say, but I would say that it is most definitely NOT "usual"l for a rear wheel to lock-up on a 205.

 

If one of the rear wheels is locking up before the fronts on a 1.9, it's likely that the compensator has stuck open and isn't limiting pressure.

[kenp 3]

I might be misunderstanding what you're trying to say, but I would say that it is most definitely NOT "usual"l for a rear wheel to lock-up on a 205.

 

If one of the rear wheels is locking up before the fronts on a 1.9, it's likely that the compensator has stuck open and isn't limiting pressure.

 

 

Yep that was my thinking too - I've recently had the beam rebuilt (and a top job he did ) so the rear brake system was disturbed, new pipework on the beam. Don't know if the problem was there before as it's the gf's car and I only found it whilst road testing the car a few days after the beam was done - decided to try an emergency stop which is when the the locking up manifested itself.

 

Ideally I presume that both compensators should be changed at the same time?

[feb 47]

When I had this happening I changed both compensators, firstly I changed the one from the same side IIRC which didn't solve the problem and then changed the opposite side one and all was well.

Edited December 7, 2011 by feb

[kenp 3]

OK, having got around to looking at the problem... changed the N/S compensator but found on the road test that the O/S rear was now locking up instead... so changed the O/S compensator as well.. road tested again and now the N/S is locking up again, only not as viciously as before...

 

The compensators that I've fitted came off my old Pug when I fitted a bias valve.. that car didn't have a rear locking prob as far as I can remember so I'm trying to think if there's anything else that could be causing this effect... if the front brakes were low efficiency (calipers are old now ) then could that cause this even with the compensators in line..?

[eliteracer 2]

probably nothing to do with it, my old 1,9used to do this and i found a crack in the "bell" section of the disc, when i turned thedisc and some one presssed the brakes it would open up in certain posistions and jam the caliper. changed the discs and all was well.

[feb 47]

If used compensators have been sitting they could have seized.

Best to buy new ones.

[kenp 3]

Yep, I did think that might have happened.. I was trying to be a cheapskate having just shelled out for a new rear beam etc!

 

Rear discs are new btw.

 

I'll probably try some new compensators....

[keeperlit 4 1 Cars]

Hi KenP, did the new compensators fix the lock up problem? I've got same problem now after the car sat for a year while the rear beam was rebuilt.

 

Cheers,

Keith

[kenp 3]

Replied to your PM Keith, but for the benefit of other forum members - yep, fitting a pair of nice shiny new compensators sorted the problem