Front Brake Caliper Pad Retaining Springs

[TDIvolvo]

Originally Posted by stellamon

They said the wrong sized discs were on the car in the first place, so they had to fit new discs and subsequently new pads also. Apparently the ones I bought were not the right size.

It looks like they have messed this up.

They have not understood the brakes on this Volvo, they have billed you for discs you possibly didn't need because of their ignorance and now it is possible the pads will be worn in such a way they will not sit right on the discs you now need.

Garages lack the skill and thought of older mechanics these days. Annoys me.

[oragex]

I would disagree using a C-clamp to force-push back the piston, it can cause valves damage. Instead, open the bleeder (might be stuck), attach a small tube+can so not to spill the fluid on the floor and push back the piston by hand.

[TDIvolvo]

Originally Posted by oragex

I would disagree using a C-clamp to force-push back the piston, it can cause valves damage. Instead, open the bleeder (might be stuck), attach a small tube+can so not to spill the fluid on the floor and push back the piston by hand.

Good tip.

This also serves as an on the fly means to change some of the brake fluid.

The fluid in the caliper will have lived in that area more or less since it was filled and primed.

It is also a good idea not to let heaps of fluid return up via the ABS unit and into the reservoir as it may contain contaminants and rubber particles which can gum things up.

Pushing it back by hand may not always be possible, I would still suggest something to help push it back in will be needed. I sometimes simply use the wooden handle of a hammer and gently pry it back against the disc, if that fails and it's stuck a bit some big water pump pliers.

Also, Red Rubber Grease is the only grease that should come into contact with the internal braking components. I have a 500g tub which I use to lightly lubricate the pipe and unions before fitting (ordinary grease here COULD find it's way into the fluid) to help prevent them sticking, on bleed nipples, on the pistons around the seal or all over the piston if I am rebuilding a caliper. If your not sure about why you ought to do this, the next time you have an old brake seal put it into a little tub with some engine oil or ordinary grease.