hi im having a major problem with my brakes at the mo. when im hit high speeds my brake pedal goes rock hard and when i go to press the brake, it doesnt stop just drags me across the road. but as soon as i do press the brake and take my foot of it goes bk to normal. ive also had my abs light come on which i took it to my local subaru garage to do a diagnostic test and they said everything is A ok.
has any1 else had this problem or know what it could be please.

 

what model car do you have? plus the year, plus the type of brakes fitted to the car (2 pots, subaru 4 pots with the subaru writing on them or brembo 4 pots?)

Tony

 

Could be a iffy master cylinder if ur pedal is going hard, or there could be a leaky vaccum pipe.

 

its a 1998 wrx car is sweet except for this problem with my brakes standard brakes and wheels n tyres

 

quite possibly the "non-return" valve in the vacum pipe from the manifold to the servo has failed............

alyn

 

right got back from subaru today they checked over my brakes again and they said its my n/s/f ABS sensor, now i can understand that could be the reason for my ABS light coming on but would that really affect my brake pedal going hard as soon as i hit high speeds and loosing half of my braking power. i said this to them and they said we wont know till we change the sensor. could this be really possible?

 

Could be. If the system thinks the wheel is locking (dodgy sensor) then the ABS pump will cut in and could make the pedal feel hard. Just a guess.

 

i think stockcar you could be right its getting a lot worse now just been out and notice now when i slowly go through the gears its fine intill i hit about 80-90mph but if i put my foot down the brake pedal seems to go rock solid at about 60mph. its so annoying

 

help another garage another thumbs up. they said everything is fine they checked the master cylinder and all the pipes and all the brakes aint they said everything is fine do. help me im am really stuck now

 

noticed today as i was travelling down the a1 that when my brake pedal goes hard and i brake it pulls to the right. if that helps

 

could be a siezed / seizing left hand front caliper ??

 

but could that make my brake pedal go hard only over 65mph

 

I had that happen on my my97 with 2pots ,once behind another scoob,he was lucky lol.
I changed to 4 pots and its totally solved the problem.I think the caliper was fecked.

 

hi update its not the non return valve in the vacuum pipe had that changed today and its still doing it plus im £130 down great

 

right update on my braking problem they rekon now my pedal is going hard due to the abs pump kicking in due to a faulty sensor so booked it in to change the sensor nxt wednesday.

 

abs sensor changed £328 pound down still doing it. for **** sake, total now over £500 still cant sort out the problem HELP!!!!

 

had the other abs sensor change and now its sorted cheers guys for ur help