Bobbeh Posted September 29, 2004 Share Posted September 29, 2004 As posted in other thread.. just incase it wasnt seen: My friend was suggesting that the 2 shims could cause uneven wear on the piston seals due to the gap on that half moon shape, and it would be best not to use them or only use one.. my thoughts were leave it how toyota had intended but he was pretty adament it wouldnt make the blindest bit of difference if they werent in there. What do you think? Link to comment Share on other sites More sharing options...
merckx Posted September 29, 2004 Share Posted September 29, 2004 Just did my front pads on Monday and this never occured to me. But I agree with your reasoning that if Toyota designed it this way then they should be okay. My pads had a full shim covering the whole pad and on top of that was the one with the half moon shape. Not sure if the diameter of the half moon shape of the shim is the same size or larger than the diameter of the piston anyway. Link to comment Share on other sites More sharing options...
Bobbeh Posted September 29, 2004 Author Share Posted September 29, 2004 What I mean by the moon shape is that the piston is round right? and when it hits the shim half the circle his the half moon shape and presses the pad. His point was, was that the 2 shim plates made the drop on contact uneven and could cause damage to the seals? I dunno, i just wanted it left as it was. I am not doubting what he was suggesting, just wanted some other thoughts about it. Link to comment Share on other sites More sharing options...
Red Posted September 29, 2004 Share Posted September 29, 2004 Dude, Sorry for not replying in the other thread!! I agree with you mate - leave it as it is - The supra brakes are not notorious for having problems, and they are all getting on a bit now. I guess if it did cause a problem, it would have shown by now in a good few cars. I can see what your mate is saying though. Link to comment Share on other sites More sharing options...
merckx Posted September 29, 2004 Share Posted September 29, 2004 What I mean by the moon shape is that the piston is round right? and when it hits the shim half the circle his the half moon shape and presses the pad. Yep I already knew what you were getting at, but I didn't measure the dia of the half moon cut-out on the shim . Does the piston push against the shim and the backplate of the pad or is it larger than this and only pushes against the shim. I'm sure there is good reasoning behind the design. Link to comment Share on other sites More sharing options...
Bobbeh Posted September 29, 2004 Author Share Posted September 29, 2004 No worries Red Link to comment Share on other sites More sharing options...
Bobbeh Posted September 29, 2004 Author Share Posted September 29, 2004 Originally posted by merckx Yep I already knew what you were getting at, but I didn't measure the dia of the half moon cut-out on the shim . Does the piston push against the shim and the backplate of the pad or is it larger than this and only pushes against the shim. I'm sure there is good reasoning behind the design. I think half presses against the shim and half presses the pad, hence the drop you'd get with the 2 shims in place. Link to comment Share on other sites More sharing options...
Red Posted September 29, 2004 Share Posted September 29, 2004 Hmm the shim is at least a mm thick, I cant see there being that much sideways play with the pistion, so I guess it would just press on half the shim. Link to comment Share on other sites More sharing options...
Scooter Posted September 29, 2004 Share Posted September 29, 2004 i think some people run with no shims at all just straight piston to pad contact....... Link to comment Share on other sites More sharing options...
Ian C Posted September 29, 2004 Share Posted September 29, 2004 I run no shims, it made an unbelievable (positive) difference to the brake pedal feel and zero impact on brake squealing. YMMV -Ian Link to comment Share on other sites More sharing options...
Terminator Posted September 29, 2004 Share Posted September 29, 2004 The only way I could see that this would have a negative impact is if less than half of the piston and a continuous half, was in contact with the shim. Link to comment Share on other sites More sharing options...
Bobbeh Posted September 29, 2004 Author Share Posted September 29, 2004 Originally posted by Ian C I run no shims, it made an unbelievable (positive) difference to the brake pedal feel and zero impact on brake squealing. YMMV -Ian Yeah, this is what he was going on about, makes you wonder why Toyota put them in then?! Link to comment Share on other sites More sharing options...
Scooter Posted September 29, 2004 Share Posted September 29, 2004 i reckon it could just be a 'make sure' measure. Ian's don't squeal but maybe 10% or so would and they didn't want their £40K flagship model being constantly brought back to the dealers with pi**ed of owners complaining of squealing brakes:) Link to comment Share on other sites More sharing options...
Matt B Posted September 30, 2004 Share Posted September 30, 2004 I'm running no shims but I have the KAD setup front and rear. I agree that it will improve pedal feel a great deal but some people say it causes squeal but I think that has more to do with the pads you use. My only complaint is a slight rattle on the rears with no shims... Cheers Link to comment Share on other sites More sharing options...
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