Brakes with suicidal intentions

levi · Post by **levi** » Tue May 12, 2009 6:36 pm

What is the cause that makes the car, when braking at speeds above 80/100kms/h, from time to time (not always, actually it is rarely) beastly and suddenly pull to the left?

The brakes have been bleded this weekend and the problem persists.

There are no loose wheel nuts, brake pads are recent in all brakes and discs are in good shape

Car is a '90 Turbo without vented front discs

Thanks in advance

Raffadakis · Post by **Raffadakis** » Tue May 12, 2009 10:24 pm

I would say, this might have something to do with the steering mechanism adjusments! That's usual way to test it: Drive the car, remove hands from steering wheel and break. If it pulls to any direction, you should get you're steering geometry checked/adjusted.
But thinking about it again, it really shouldnt do it, while you're having your hands at the steering wheel... Have you checked the brake pipes for any leakage?

Greets
Raff

levi · Post by **levi** » Fri May 15, 2009 10:55 pm

I allready tried a steering allignment and it isn't that.

Pipes do not have any leakage.

Today I've made 5kms without braking and in the end I found the left front disk brake to be very hot. So it seems that this caliper is not releasing as it should and is allways braking a bit.

Wich is strange because front calipers have allready been exchanged a week ago in order to try to resolve the brake problem, but does not make difference.

bkf_uk · Post by **bkf_uk** » Fri May 15, 2009 10:58 pm

sounds to me like you have a warped disk, or the hub is shot, try new disks, if this doesnt help replace the front hubs. if it still pulss theres somthing amiss elsewhere.

B18FT - LOVER · Post by **B18FT - LOVER** » Fri May 15, 2009 11:15 pm

bkf_uk wrote:sounds to me like you have a warped disk, or the hub is shot, try new disks, if this doesnt help replace the front hubs. if it still pulss theres somthing amiss elsewhere.

Here here, that is exact what it is...

New disc's will sort that bud..

levi · Post by **levi** » Mon May 18, 2009 3:42 pm

Hi

The discs have been "corrected" (don't know the exact word in English), exactly to erase any kind of "warped" (fledged).

Now... maybe this service have not been done correctly as I haven't driven the car before it.

Can it be the main brake pump?

gltease · Post by **gltease** » Mon May 18, 2009 5:17 pm

your bushes are all ok ??

cliffeydawlish · Post by **cliffeydawlish** » Sat May 30, 2009 6:32 pm

same problem on a turbo i have just bought with abs ive bin told lower arm bushe is dead and that is wats causing it but myn does it every time you brake hard if you feather the brakes and leave a mile gap between you and the car infront there fine but mine goes right then left ill let you know if the lower arms theory works 2 morrow ok

Iroll480 · Post by **Iroll480** » Sun May 31, 2009 1:14 pm

I think the flexible brake hose have collapsed inside. This way the brakes won't release the pressure after braking and the pads stay on the discs. The flex hose acts as a one way valve when the innards collapse, pressure can enter but can't escape. Replacing them is the cure.

cliffeydawlish · Post by **cliffeydawlish** » Sun May 31, 2009 2:53 pm

this is a good point but if the pressure was still there then the pads would stop the disk from spinning

i park mine on a hill and it rolls thus proving the pressure is being released

so i sat on a hill with my brakes on no hand break let off the brakes and it rolled instantly correct me if im erong but proving pressure is being released instantly

i tried this numoruse times and it rolled in a straight line as well

so i have replaced the lower arm bushes on both sides and problem has gone it dosent pull either witch way anymore

hope this helps

Volvo 480 Club Europe

Brakes with suicidal intentions

Brakes with suicidal intentions

same prob;em

hoses