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[grifter]

Hi

So a couple of months ago I changed the fluid, replaced back discs pads, gave the rear pistons a freeing off, not that they were seized per say, mainly gave them a bit of movement to keep them free moving - the old inny outy!. I also found the slider on F/N/S caliper a bit stuck so freed that off and checked other side, which was ok. After this the brakes had a nice sharp bite to them, for a couple of weeks, then one day it went back to how they were before i.e pedal goes quite far down before bite and more of a shove to stop.

I have noticed on very rare occasion they are back to being good i.e. firm pedal. Could it be air still in the system. I used a ezi-bleed to change fluid.

Cheers
Andrew

[Jan Suhr]

I would start with bleeding them again.

[terry paget]

I observe that the older the car, the more likely is this phenomenon. I suspect master cylinder wear.

[Nick W]

I observe that the older the car, the more likely is this phenomenon. I suspect master cylinder wear.

exactly.

[johnnydog]

When you freed off the sliding calipers, were the boots intact and did you lubricate the sliders - if so what did you use? A firmer than normal pedal could be related to the sliding caliper sticking again. Worth checking first before bleeding or dismantling the master cylinder.

[grifter]

When you freed off the sliding calipers, were the boots intact and did you lubricate the sliders - if so what did you use? A firmer than normal pedal could be related to the sliding caliper sticking again. Worth checking first before bleeding or dismantling the master cylinder.

Quite sure the boot was intact, I think it had just fallen off it's lip somehow, just the top one. I used some standard grease to lube them up. I'll give it a double check tomorrow.

[johnnydog]

Don't use copper slip on them  it is an antiseize rather than a lubricant.
Ideally, you need a heat resistant lubricant for the sliders due to the heat that can be generated ftom the brakes. I personally apply a very light smear of a CV joint grease on the slider pins before reassembly - works perfectly for me when overhauling this type of caliper.

[grifter]

Don't use copper slip on them  it is an antiseize rather than a lubricant.
Ideally, you need a heat resistant lubricant for the sliders due to the heat that can be generated ftom the brakes. I personally apply a very light smear of a CV joint grease on the slider pins before reassembly - works perfectly for me when overhauling this type of caliper.

Wouldn't ever use copperslip on moving part. If I've not got CV grease to hand just use normal grease.

[biggriffin]

I observe that the older the car, the more likely is this phenomenon. I suspect master cylinder wear.

exactly.

2nd the above....

Also in the older days we use to have a stuff called Hmp grease.