corsa1.2red
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Registered: 11th Aug 04
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Any idea why my rear drum brakes are locking up when i brake heavily at low speed? I recently changed the front disks and pads and topped the brake fluid up
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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nearly all corsa b's do this
mine did no matter what i did to the bis valve
i even disconected it and used a diff one
you just have to live with it and be ready
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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no you dont maybe you need to replace the rear brakes!?!
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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bed the fronts in & re-bleed them.
if there is air in the front of the system, the rears will over-compensate so lock up. Also the auto-adjuster in the rears might need resetting.
could also be a bit of a sticky bias valve.
Also, have you lowered the car at all?
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corsa1.2red
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Registered: 11th Aug 04
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quote:
Originally posted by PaulW
bed the fronts in & re-bleed them.
if there is air in the front of the system, the rears will over-compensate so lock up. Also the auto-adjuster in the rears might need resetting.
could also be a bit of a sticky bias valve.
Also, have you lowered the car at all?
The fronts are bedded in and there is no way there should be air the system. How do i get to the adjuster at the rear? Also it is not lowered
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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dont touch the adjuster thats not the problem, how many miles has it done!? i recon u need new rear brakes
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corsa1.2red
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Registered: 11th Aug 04
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why's that. If they needed replacing, this would be becuase they don't lock or brake at all. My hand brake works fine and the brakes just lock up when i apply quite abit of pressure on the pedal.
Would it be becuase there is too much fluid in the system?
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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mine did it
my mates did it
the ones with the inline valves are best
the ones " like my old one" which had a bias valve are crap
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Adam-D
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Registered: 11th May 02
Location: Cheshire
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onyl other thing i could suggest is rest the auto adjuster so the shoes anrt as close to the drum
edit- and replace the retackting "sp" springs these can wear in time thus the rear braking power increases
[Edited on 08-09-2004 by Adam-D]
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big eck
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Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
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It sounds like the Bias valve is jammed and the car thinks that there alot of weight in the back when theres not hence more brake pressure to the rear
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corsa1.2red
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Registered: 11th Aug 04
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could be as when i replaced the front brakes the pdeal went straight to the floor due to sticking pads, so the rear shoes lay have over componsated.
What you think
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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when the rear brakes need replacing the tend to lock up first, seen it before, check the bias spring if you like, its on the rear beam on the passenger side, if the cars not lowered tho cant see that being a problem
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corsa1.2red
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Registered: 11th Aug 04
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where? in the drum?
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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the bias valve is on the rear beam, on the drivers side, look under ull see it. but ithink itll be the rear brakes, when were they last replaced?
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corsa1.2red
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Registered: 11th Aug 04
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i will have a look. what should i do with it? How much for new drums? Woulddn't my handbrake not work if the drums needed replacing?
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Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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didnt wanna start a new thread.....
i have the opposite problem my handbrake barely holds the car and its fully adjusted up.
any idea's
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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quote:
Originally posted by corsa1.2red
i will have a look. what should i do with it? How much for new drums? Woulddn't my handbrake not work if the drums needed replacing?
no, they get grabby when worn hence they are locking up, so they will hold with handbrake
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corsa1.2red
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Registered: 11th Aug 04
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when i had my MOT they were fine as they pulled the handbrake up and tit locked so they said it was fine. I will have a look at the bias valve. What shall i do with the valve and how much are new brake shoes for the rear?
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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what do u want to do with the valve, wel ldepends if its locked up but if you do drive a 1.2 8v then you cant sdjust it, jus twack wd40 on it or somethimg
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corsa1.2red
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Registered: 11th Aug 04
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yeah, i will do that. it may be jammed. Hopefully i won't need to renew the brakes
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corsa1.2red
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Registered: 11th Aug 04
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Soted the problem. I had put too much Brake fulid in the container, so i soaked some up and it doesn't lock now, even at high speed.
1.2 Models rely on pressure for regualtion and 1.4-1.6 models rely on load pressure for regualting.
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csweatherston
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Registered: 16th Jan 06
Location: Devon
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load pressure??.......my rears lock up all the time!!!! think im too low...can i modify the valve?
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