Brakes stuck on

[n11tht]

I've got quite a worrying issue with my brakes at the moment and after some advice please.

A few weeks ago i went for a drive and the brakes started to bind, took it to a friend who's a mechanic and he replaced the brake lines thinking this could be the cause.

Turns out it wasn't they got stuck on the following day, so booked it into a garage to be investigated. They suggested the master cylinder so that was replaced but it hasn't cured the problem.

There now suggesting either the brake servo or tandem pump. When i leave the car for a few hours the brakes are no longer stuck on and if i pump the pedal with the engine off the pedal goes firm, turn the engine on and the pedal goes back to normal. Press the brakes again with engine off and the pedal slowly gets firmer.

After searching this makes me think its not the servo but i may be wrong, what do you all think?

Thanks

 

[Steely]

which brake is binding?

it'll either be just the one, or a nearside front and ofside rear... & visa versa

 

[LE04HDB]

I assume the garage checked that the pads are not stuck in the carriers or the caliper pistons are not seized? I had a front caliper seize up on my old bmw, completely rusty around the piston and it got very very hot! Smelt like the clutch was knackered.

As said, check the basics first before paying out big bucks for something that wont fix the fault.

 

[jamesy_m]

If it's just one, it'll pretty much always be the caliper sliders seized, or the piston seized.

If no garage checked this before replacing parts, they're honestly not worth going to again.

 

[n11tht]

which brake is binding?

it'll either be just the one, or a nearside front and ofside rear... & visa versa

Its all four of the brakes that are getting stuck on which leads me to believe its not a calliper issue, after a few miles of driving the car will start to brake itself without me touching the pedal which is a little scary.

 

[Steely]

Its all four of the brakes that are getting stuck on which leads me to believe its not a calliper issue, after a few miles of driving the car will start to brake itself without me touching the pedal which is a little scary.

pointing towards a servo vacuum problem,

I had a servo die 2 years ago, but for lack of assist, yours seems to do the opposite,

if you lift the brake predal back towards you does it stop?

how did you know all 4 were binding? are the disks blue?

 

[m0rk]

Interesting

Not seen this before the other week & on this thread

http://www.seatcupra.net/forums/showthread.php?t=339666&highlight=MOT+bleed

 

[n11tht]

pointing towards a servo vacuum problem,

I had a servo die 2 years ago, but for lack of assist, yours seems to do the opposite,

if you lift the brake predal back towards you does it stop?

how did you know all 4 were binding? are the disks blue?

yeah the discs are blue and we had it on a ramp and tried spinning the wheels individually but each one was binding.

I don't fancy having the servo replaced sounds very expensive with the labour involved. I might try a second hand tandem pump and see if thats any better

 

[stec66]

This is a stange and hard to solve problem. Trying fix it myself atm. I have also not found and thread that ever have a solution. Servo being replaced tomorrow.

TBH we replaced the master cylinder, its the obvious / cheapest thing to do

 

[stec66]

where is the tandem pump. what does it actually do exactly? i know im a mechanic but i have NEVER replaced one

 

[n11tht]

where is the tandem pump. what does it actually do exactly? i know im a mechanic but i have NEVER replaced one

its on the right hand side of the engine, from I've read its essentially a fuel pump with an extra hose coming off it that creates the vacuum for the servo. i might be wrong on that though. looks like this http://www.ebay.co.uk/itm/VW-VOLKSWAGEN-SEAT-AUDI-SKODA-DIESEL-FUEL-VACUUM-PUMP-038145209E-038-145-209-E-/260922556146?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3cc0323ef2#ht_573wt_1303

 

[Steely]

The servo shouldn't be that expensive labour wise, it's not an engine out job like many think

 

[stec66]

aahhhh. The Vac pump. ok. yes.

 

[stec66]

Its a sod though.