joshF
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Registered: 21st Oct 07
Location: Spalding
User status: Offline
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hello.
Iv got abit of a problem,When i brake harshly or hard my back brakes lock up and the front dont? And if they dont lock up the passenger side rear drum makes a grinding sound? dont suppose any of you have any ideas before i remove them and inspect.
Another thing is when im reversing off my drive when coming off the clutch and turning i feel a rumble in the clutch pedal only when turning though?
car is 1.2 corsa
Thanks josh
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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I used to get this, if the car had been standing for a good few hours, probably 6 or more after heavy rain my rears used to lock up and I got the grinding sound, after a mile or 2 it would stop though, I used to just drive for a minuite with the hand break on though,
I can only summise that the rain gets into the drums and puts a layer of rust on the inside which reduces the distance between the pad and the drum so when you press the pedal the shoes touch the rust, this is what happens on my car now when I have rusty discs, the brakes always seem dead sharp
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Mike GSi
Member
Registered: 3rd Jan 07
Location: Ipswich, Suffolk Drives:Astra VXR
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probably the rear brake bias controler, is the car lowered at all?
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Gareth F
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Registered: 16th Jan 08
Location: Location Location
User status: Offline
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Ive dropped mine 90mm and adjusted the bais all the way but it still locks under heavy braking, any ideas?
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mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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Mine was completly standard when it was doing it to me
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Mike GSi
Member
Registered: 3rd Jan 07
Location: Ipswich, Suffolk Drives:Astra VXR
User status: Offline
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quote:
Originally posted by munk3yrac3r
Ive dropped mine 90mm and adjusted the bais all the way but it still locks under heavy braking, any ideas?
Probably too low lol   are you sure you adjusted it the right way lol, just checking 
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joshF
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Registered: 21st Oct 07
Location: Spalding
User status: Offline
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yeah its 60mm all round?
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Mike GSi
Member
Registered: 3rd Jan 07
Location: Ipswich, Suffolk Drives:Astra VXR
User status: Offline
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Could be the reason, the corsa's have a rear brake bias controler, its automattic.
As you put more weight in the rear, more brake bias is forced to the rear by this mechanism, it sits above the axle, so when the suspension is lowered (weight is added) it tightens the mechanism, try losening it off abit, and give it a goos squit of WD40 then some sort of lube 
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SXI - Matt
Member
Registered: 8th Jul 07
Location: Leicestershire Drives: Corsa C SRI
User status: Offline
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You need to make the bracket or the adjuster longer so it lossens off abit as even when fully adjusted is'nt enough, when it's down 60mm the car adjusts the brakes thinking the back is full as it would sit that low with 3 people in the back, so puts more braking to the back drum's but as the back end is actually still light due to being no one in it it will lock up, can be quite bad in the wet would definalty get it sorted
[Edited on 14-11-2008 by SXI - Matt]
[Edited on 14-11-2008 by SXI - Matt]
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joshF
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Registered: 21st Oct 07
Location: Spalding
User status: Offline
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ok il have to sort it then,
thanks alot
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joshF
Member
Registered: 21st Oct 07
Location: Spalding
User status: Offline
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dont suppose any of you have a picture of the bias controller and what to adjust
many thanks
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marklawton
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Registered: 24th Apr 05
Location: Pensby, Wirral Drives:Golf mk4 GTI
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quote:
Originally posted by munk3yrac3r
Ive dropped mine 90mm and adjusted the bais all the way but it still locks under heavy braking, any ideas?
i had mine lowered 100mm and never touched mine and it was fine. you can take them off though and then just put it back on for the mot if they say anything
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Gareth F
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Registered: 16th Jan 08
Location: Location Location
User status: Offline
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^^^ wont that stop them from working?
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av it
Member
Registered: 4th Mar 08
User status: Offline
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another solution is if your modding your car then fit bigger brakes to ease off the rears
but if not then yes adjust the bias valve thats attatched to the rear beam (some corsa's dont have them)
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sand-eel
Member
Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
User status: Offline
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quote:
Originally posted by av it
another solution is if your modding your car then fit bigger brakes to ease off the rears
but if not then yes adjust the bias valve thats attatched to the rear beam (some corsa's dont have them)
That will make it even worse putting bigger brakes on the front. what happens? i'll tell you more weight transfer to the front = the back end gets lighter so will lock up even easier.
The only way is to adjust the valve at the back on the slider, slide the nut as far back as it goes and as said you may need to attach another bracket to make it go further back still.
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Gareth F
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Registered: 16th Jan 08
Location: Location Location
User status: Offline
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about to have bigger brakes put on but i was getting this sorted first lol
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av it
Member
Registered: 4th Mar 08
User status: Offline
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i put a disc conversion on mine and wilwood bias valve and it still tried to lock slighty UNTIL i oversized the front brakes then it gets more pressure to the front not the rear because of the bigger calipers and its fine now and no trying to skip me out on bends
[Edited on 15-11-2008 by av it]
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Mertin
Member
Registered: 12th Oct 05
Location: Scotland
User status: Offline
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What age and model of corsa? As my 1.2 8v didnt have a brake bias valve, only the sports and post 97 corsas have it iirc
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joshF
Member
Registered: 21st Oct 07
Location: Spalding
User status: Offline
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its 1995 ls model,
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