The squeal being direction sensitive gives a clue to its origin.
If the centre of the line of action of the force applied by the piston is too close to the trailing edge of the pad, there is a mechanism which can create squeal, and I'mnot surprised that copperslip hasn't cured it.
Typically when a brake is susceptible to this squeal mechanism there will be either a stepped piston or a partial shim which will bias the application force towards the leading edge of the pad when the vehicle is travelling forwards. Obviously, when you reverse, the leading edge becomes the trailing edge....
To fix the fault;
- if the piston is stepped, make sure the piston has not rotated away from the nominal alignment
- if there are partial shims, make sure they are the genuine items, and the correct shape and thickness
- make sure the pads are genuine ones rather than spurious ones
Last edited by: Number_Cruncher on Sat 29 Sep 12 at 23:45
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Volkswagen Polo IV - 03 1.4 Squealing re.. new
Volkswagen Polo IV - 03 1.4 Squealing r.. new