205 gti braking issue

[Ciaran]

I've only just bought my 205 gti and was driving down the road this afternoon when my brakes seemed to have stopped working for a while.

I hit the brake pedal and it travelled all the way to the floor, let the pedal come back up and it worked fine then. This happened 3 times in 10 minutes while travelling in traffic.

Can anyone shed any light on the problem?

I did 400 miles on Saturday with no issues whatsoever.

Thanks

[megamaniac]

Leak or master cylinder failing.

[Ciaran]

megamaniac said:

Leak or master cylinder failing.

Thanks.

Don't see any leaks so I'll order a new master cylinder.

I've just checked on Euro Car Parts and there is 6 to choose from - very confusing!

[Old Merc]

You should get the correct one if you give reg` no of car,diameter 20mm or 19mm (you can see it on the side of the m/cyl housing)and the number of brake pipes going in.

[Ciaran]

Old Merc said:

You should get the correct one if you give reg` no of car,diameter 20mm or 19mm (you can see it on the side of the m/cyl housing)and the number of brake pipes going in.

Cheers!

[Ciaran]

Got the master cylinder changed today. The brakes still feel a bit spongy and when stopped (engine on) pumping the brake I can hear a "squelching" sound - is it air in the pipes?

The brake pedal doesn't travel as far as before but doesn't bite as early as I thought after replacing the cylinder.

Any advice gents?

Thanks

[DiscoStu]

Have the brakes been bled correctly?
Could be worn hoses flexing under pressure.
Any fluid loss from unions or bleed nipples?

[shalmaneser]

after bleeding a system from (nearly) empty, as you will have done having changed the M/C, I always rebleed after a few hundred miles to get the last of the air bubbles out. Definitely worth doing this before you start replacing stuff. Provided, of course, that nothing is visibly leaking!

[Ciaran]

Hoses look to be in good condition.

There doesn't seem to be any leaking, will try and bleed them this weekend.

Thanks.

Edited by Ciaran on Thursday 28th October 08:09

[Old Merc]

If its a 1.9 you have?Its very difficult to get the air through the rear calipers.