mk 4 golf brakes fail when driven through water

[50 pence]

hi everyone, got a problem with my brakes on my mk 4 gttdi on on a o2 plate its started in the last couple of days the prob is when driving through back lane puddles and over small road floods the brakes will fail ie the pedal goes so hard you can not apply pressure on the brake pedal to stop its exactly like when being towed with out the engine running the brake pedal will be hard. i will pull over stop the engine for a min fire back up the brakes will be working fine again, what could be causing this problem can anyone help please!!!

[MrRogers]

Checked ur fluids mate?

[Adam]

Could be normal.

Brake Test
When you finally have passed the Flood, it’s time to test the brakes. Try the low speed and stepping on your brakes. If you do not stop, it means that your brakes damaged by flood waters earlier. Drain patiently and slowly. Way by pressing the brake pedal with your left leg while still maintaining speed with your right leg.

[50 pence]

LOOKED AT THE FLUID IT IS AT FULL MARK BUT LOOKS A BIT DIRTY NOT LIKE BRAKE FLUID SHOULD BE

[Adam]

When was it last changed?

[50 pence]

IM NOT SURE AS I HAVE RECENTLY BAUGHT IT BUT ON THE VW ADVISORY STICKER IT SAYS TO CHANGE IT AT 95OOO MILES AND THE CAR HAS DONE 97000 COULD THIS BE THE PROBLEM ITS REALLY BAFFLED ME IV NEVER HAD THIS PROB WITH ANY CAR BEFORE

[GOLF_STU]

Could be normal.

Brake Test
When you finally have passed the Flood, it’s time to test the brakes. Try the low speed and stepping on your brakes. If you do not stop, it means that your brakes damaged by flood waters earlier. Drain patiently and slowly. Way by pressing the brake pedal with your left leg while still maintaining speed with your right leg.

+1 could just be your abs coming on if it thinks its lost traction

[Wayne]

As above could be normal.

[50 pence]

im sure this not normal just driving down small puddle lanes and it does it, it does not feel as if the abs is on, the brake pedal just goes hard like the brakes have compressed like a generator im getting the brake fluid changed today to see if this is the cause in my opinion this is a seriouse problem and needs to be sorted before i have an accident!!.

[earlymk2]

Its worth checking the brake servo feed pipe. Sounds like you are loosing brake vaccuum. Not sure why it would do it when you go through puddles tho!!!!