The OSF brake was not releasing well, there was a cyclic squeek off the brake whilst at low speed, all other corners were silent.
Car braked in a straight line, no just this irritation, and as Andy lightweight would say, 'he needs a little project to do'.
After the car show on Saturday in the car, the wife watching F1 on Sunday, yesterday was a good day to start.
Last week it passed the MoT easy, but this 'sicking was apparent after the MoT, so I readied myself with a repair kit from Biggred bakes in Worcester.
The kit came with rubber seals and all new pistons all for the price of just over £72 collected, almost suspiciously cheap.
Parts all bagged up very professionally so a good start.
Started with the front brakes, then move on to the rear.
Callipers off easy and pads all marked up the dust seals were removed to reveal he expected rust on the piston face and the cast calliper body as expected.
Eased the pistons out progressively using the 100 psi airline applied to the hard line inlet side of the calliper and all came free eventually will a loud crack and fluid caught in a rag, eye protection needed!
A good deep clean and lots of scraping with a sharp scriber prepared the seal groves, and with grease applied from the kit the new parts lid into place.
Set the 20 degree orientation of the piston recess as per the Haynes manual. Still none the wiser why there is this recess in machined into the piston, but ATE will know better than me for sure.
The new dust seal popped into place and even the pesky steel clamp ring fitted!.
All good and back onto the car.
How easy can this get??
Well...
To the rear callipers. I expected the same breeze of a job, but oh no, this is DIY 911hilllimber style. Always, always a twist.
Stripped the callipers and far harder to get the pistons out, but won the fight in the end.
The trip wire got me when I saw the rear pistons.
The original M type callipers have a complex design with some kind of pad retraction device within the piston that takes a 4mm dia pin in the cast body.
The new pistons do no take this design in any way.
Fortunately the original pistons are is quite good shap, no rust on the seal surfaces, and I have two old but new ATE repair seal kits 'in stock' from some distant past so I can rebuild the rears later today.
Have asked Biggred if they make the right pistons.
Design 911 have the right pistons but they do not have the retraction device, obviously the aftermarket suppliers delete this (unnessacery?) feature?
Hope to get the parts all back on the car over the next few days and then to the Big Event, bleeding, but I have demon weapon, Mrs Hillclimber who is fully trained in pumping.
