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- Refacing front brake
pads
- For a reason I cannot establish yet, the front brakes
suffer bad squeal.
- After fitting new pads they are fine, but
typically after a track day they
- will begin to squeal. A light tap on the brake pedal
will stop the squealing,
- but this only stops for a few seconds. They seem to
worst driving in a straight
- line, turning the wheel even very slightly will reduce
the squeal.
- Perhaps some glazing is the cause.......old pads:-
-
- The pads wear more at the top of the pad compared to
the bottom, perhaps
- 2-3mm in some cases.
- I would suspect wheel bearings, but these were renewed
only a few thousand miles
- ago.
- I wanted to look at a way of re-surfacing the old pads
because there is still plenty of
- material left on them, just that the wear is not
exactly even from top to bottom.
- I wonder if the pressure from the springs behind the
caliper pistons is overcoming the
- friction of the seals against the piston circumference
and is actually driving the pistons
- out on their own. I could pull the pistons out and clip
a spiral or two from the springs, but
- first I will try skimming some old pads to accelerate
the wear by a mm or 2 each time
- the squeal re-appears. I should end up with nearly worn
out pads if the squealing continues
- to the point where the pistons springs won't be having
the same affect as is the pistons
- were fully pushed into the calipers.
I have no clue if the following is an acceptable practice........but I like
to try stuff out.........
- I could really do with a small milling machine (cheers
MR for that thought !!), but I have a drill press,
- so would make use of that. The pad material is actually
quite crumbly. Ever taken the edges off
- with a file ?, material comes off really easy.
-
- Grind the point flat on the largest drill that will fit
in the chuck.
-
-
-
-
-
- The pad material is soft enough to be able to remove
~1mm of material at a time
- and slide the pad by hand !
Youtube video here.
- Light dusting with a flat file.........
-
- Re-surfaced pad on left, new pad on right. Apart from
slight colour difference (old pads
- were ex trackday, so have had quite a bit of heat
though them, surface texture was the
- same.
-
- The back of the pads have a sticky pad which stick to
the pistons and presumably
- help prevent squeal (yeah...right). Because these are
old pads going back in, the
- "sticky" bit, is not sticky anymore, so......
- Wurth anti-squeal spray, good stuff which I used to
cure squeal from the rear brakes ....
- ........which was'nt actually coming from the rear
brakes at all :-)
- Still "worth" a try on the fronts.
- Brake bleeding.
- I bled the brakes before the trackday, and again before
I re-fitted the re-surfaced pads,
- air bubbles came out on both occasions !.
-
- Been out for a drive, only a few miles, problem is that
I don't expect the squeal to re-appear
- unless I drive at least 20-30 miles.
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