Quote:
Originally Posted by Bonzo
Hi Sam
Are you using the used calipers from the donor car & have you changed the pads n discs ?
In my personal experience, older calipers that have been run for a long time with low friction pad material ( Or have been laid up for a long time ) are often a problem when new pads are fitted.
Moisture can & will find it's way past the pistons outer dust seal, this creates a layer of rust or crud on the surface of the piston.
Fine whilst it is still running on the same pads but the moment the piston is pushed back in to allow fitment of the new thicker pads, the crusty surface of the piston gets pushed past the calipers inner seal & tends to bind ( Getting worse with harsh braking )
If this issue persists, perhaps you should consider a new caliper seal kit, personaly, I would inspect the pistons condition first, if damaged by rust it would probably be almost as cheap to buy refurb calipers .
I hope this make some sense.
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Yes Ronnie I'm using the donor's calipers with new standard pads. The donor drove and stopped well with them, and they had been fitted new at MOT just over a year before I got my hands on it, so I didn't feel a need to refurb them. However, it's was 3 years since they were last used on a car, before I used them on Saturday, so your explanation does make lots of sense.
I'm going to price up a recon set of calipers.