Master Cylinder and Rear Backing Plate Questions

GTE

Hi all,

Regarding a MK4 Golf, I have a few questions.

1) Where could I source a set of rear brake backing plates/guards? I am not sure of their actual name, so I am having trouble finding them on eBay. Micks Garage don't have them and I have not had time to check the local motor factors.

2) For the past couple of years I have noticed that with the car stopped, over the course of nearly 10 seconds I can press the brake pedal hard and it will slowly move towards the floor. However, the NCT for the past few years has shown no brake issues and when I slam on, the ABS will kick in.

I am inclined to say the master cylinder is acting up but with a positive ABS action and no NCT issues, maybe I am worrying over nothing.

3) Regrading the rear drivers side brake; if one of the caliper sliders was stuck in its outward position, would this then cause excessive wear on the outer brake pad?

Thanks all

GTE

Finally found one on eBay; thanks to a very comprehensive fitting list.
This is the correct one?

http://www.ebay.ie/itm/GENUINE-AUDI-VW-SEAT-SKODA-LEFT-HAND-REAR-BRAKE-DISC-BACK-PLATE-1J0615612D-/251691745374?hash=item3a99ff405e:g:6v0AAOSwZkJUS-vk

Decent price? I will try local on the basis of advice here as I would prefer to go there rather than eBay.

martinr5232

I dont think those back plates are that expensive in the main dealers.

George Dalton

€6.83 ex VAT from your local VW dealer.

my3cents

OP just a thought about the pedal travel, is the vacuum hose on the master cylinder air tight?

martyc5674

my3cents wrote: »

OP just a thought about the pedal travel, is the vacuum hose on the master cylinder air tight?

A loose vacuum hose isnt going to cause your pedal to travel further than it should...the vacuum is just to assist your braking effort, so a loose hose is more likely to result in a harder than normal pedal.
A passing seal in master cylinder/any slave cylinder or a lot of air in the system however would be the most likely causes of a sinking pedal.
If youve excessive wear on one of your disks as mentioned most likely a sticking caliper...which will lead to excessive heat which can boil the fluid which then passes the seals...or damages the seals, thats where id be looking first as it needs fixing anyway regardless.
Marty.
Marty.

blackbox

Sinking brake pedal when stopped - some pedal creep is not too unusual in a diesel car, but shouldn't go right to floor. I think it is due to using a vacuum pump rather than taking vacuum from intake manifold.

In a petrol car it implies leaking seals, probably in master cylinder.