Hi, I fitted new front disc pads recently. They were slightly thinner than the ones I took out. They still squeek when braking. What do I check? I've greased the back of them. They don't have anti squeel plates. Bus is 1976.
Can you not get anti squeal plates? Also try deglazing the surface of the discs with scotchbrite and something like brake cleaner. You can also chamfer the leading edge of the pad brake material slightly with a file. As above, use a thin smear of copaslip grease on the back of the pads.
Are the pistons stepped, like the pics? Make sure the piston faces the correct way in the caliper and fit anti-squeal shims. And why are the new pads thinner than the old ones?
Try this. Remove the pads,and replace with a thinner piece of wood,then press the brake pedal so that the pistons come out further than normal. Spray a load of wd40,brake cleaner,or whatever,then blow it all out around the pistons with a high power air line. Press the pistons back in and replace the pads after doing all mentioned above. Could just be sticky pistons. Worked for me.
Read on tinterweb could be dirty calipers? Gonna try cleaning them up nice. Let's see if that works first.
Ooh, no Sir. Clean it off, slap some Copaslip or similar on. Make sure your shims are in if you’ve got them. If not, copper grease should still do the trick.
If you have notches in the brake caliper pistons these should be facing into the rotation of the disc. You dont need anti squeal shims with that design. (ATE) If the caliper pistons dont have notches then you need anti squeal shims with holes in them facing where the notches would face on the other type. (Girling) In both cases the aim of the game is less pressure on the leading edges of the pads. Some pads have a backing that replaces copaslip with something more solid but slippery. Then a little copaslip on the back of the pads will last 5 minutes or so until it squeezes out and rubs off.. Make sure the spring plate fitted on the fixing pins is the right type for the calipers. One type is made by ATE, the other Girling. My bus has one of each..
Always works for me. It shouldn’t be on there long enough to do damage. It’s just to soften any buildup before it’s blown off.
Yes, you do. The ATE anti-squeal shims have tabs that locate in the step in the piston to ensure it faces the correct direction. The part numbers are 211615231 and 211615232 https://www.justkampers.com/2116152...al-shims-with-tabs-for-vw-t2-and-type-25.html or https://www.buttysbits.com/?product...ims-for-t2-t25-t3-models-runnimg-ate-calipers Some replacement shims can be used on either side of the caliper – you bend the tabs that you need. https://www.brickwerks.co.uk/t3-par...m/anti-squeal-shim-t3-early-ate-calipers.html
Earlier/later pads are different thickness. I know this as I bought the wrong ones for my '73 and there wasn't room for them. I believe '73 was the change year which makes buying pads for a '73 a bit hit and miss.
You may find your new pads have a rubbery coating the back to stop them squealing. Seems to do the job, but a smear of Copaslip is always worth having. Delicious on toast as well!
Definitely worth chamfering the leading edges, but I think the problem boils down to the metal embedded in cheap pads.
