Then I looked at those sliding bolts (those bolts upon which the caliper slides). They looked pretty good, but there was a little build-up of brake dust and carbon. Gibbs took this off nicely and they looked new and clean.
Here is the rubber seal through which the “sliding bolts” go. I cleaned these out too with a shot of Gibbs. Everything seemed pretty normal.
I decided to clean up the carriage upon which the caliper and pads slide and rest. There was a bit of carbon build-up.
I looked at that disc carefully and it’s undoubtedly original equipment. It appears that the outboard surface has been wearing heavily. The outboard wearing surface is actually worn more than the inside. The front discs will need replacement in the not-too-distant future. Maybe I can find a set of cross drilled discs for this ’83, which are pretty darn hard to find for some reason. These slotted discs really work fine, and I noticed the big air duct that forces air right onto the disc for cooling, which is a really nice design.
I reassembled everything. The assembly was loose and seemed to be in good working order.
The snap was re-installed to hold the pad in firm. I then sat in the car and very gently pressed the brake pedal several times to re-position the piston. Upon checking the disc I found it was firmly held, but upon tugging on the caliper a few times it seemed to release a bit. Over the road vibration should keep things freed up.
Changing discs on one of these cars is a simple operation. I’m puzzled why I’m getting the vibration and heat off the starboard disc (that’s the passenger side for you landlubbers). A road test should tell if the problem is solved. I’ll report later.
Regards, P
1983 928S 5-speed
