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Author Topic: front brake question  (Read 1484 times)

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Buffo

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front brake question
« on: November 21, 2005, 04:51:38 PM »
I had/have a squeeky front brake. I took the caliper off and there was a white, plastic spacer/washer that was put on wrong and crushed all funny rendering it worthless.

It was supposed to go around a "raised button" on the back of the brake pad...Is this plastic washer/spacer nessasary or can I get along without it...

1978 CB750K8
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Offline Bob Wessner

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Re: front brake question
« Reply #1 on: November 21, 2005, 04:59:28 PM »
Another K8 with a problem.. can't be, can it!?  :o ;D

Earlier bikes did not have this plastic thingy. Nothing between the back of the pad and the piston cap.
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Offline TwoTired

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Re: front brake question
« Reply #2 on: November 21, 2005, 05:47:34 PM »
Can you get along without it?  Many say they do.

What does it do?   The engineer in me says it keeps the puck wear even so it won't cock in the bore and bind if the pad wears unevenly.  I have seen them jammed up and dragging from this malady.  Yes, the nylon (or is it Delrin) ring was missing.

I've no idea where to get a new replacement.

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Offline Jonesy

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Re: front brake question
« Reply #3 on: November 21, 2005, 06:03:21 PM »
Quote from: TwoTired on November 21, 2005, 05:47:34 PM
Yes, the nylon (or is it Delrin) ring was missing.

It's nylon. Nylons have a melting point of about 500F. Delrin (DuPont trade name for Acetal engineering polymer, which is polymerized formadehyde) melts at a lower temp, around 350F. (You can guess who I work for...) Based on the high temps seen by brake components, nylon would be the logical choice. (Hmm... 500F and 350F.. sounds like bike models. This might help me remember without looking them up!)

I thought it was in there to act as a "softer" interface between the back of the pad and the piston, thus absorbing some vibration that would attribute to brake squeal. (My guess)

I might have an extra one lying around, if you get desparate....
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Offline DiscoEd

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Re: front brake question
« Reply #4 on: November 21, 2005, 07:17:53 PM »
Quote from: jonesdp on November 21, 2005, 06:03:21 PM
(You can guess who I work for...)

Uhhh... Jeff Gordon? I give up!

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Offline Bob Wessner

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Re: front brake question
« Reply #5 on: November 21, 2005, 07:27:42 PM »
This additional piece must have been added sometime after the K2.
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Offline ofreen

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Re: front brake question
« Reply #6 on: November 21, 2005, 07:53:41 PM »
The last set of Honda brake pads I bought for the 750 had the nylon ring included.

Greg
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Offline Jonesy

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Re: front brake question
« Reply #7 on: November 21, 2005, 08:06:54 PM »
Quote from: DiscoEd on November 21, 2005, 07:17:53 PM
Quote from: jonesdp on November 21, 2005, 06:03:21 PM
(You can guess who I work for...)

Uhhh... Jeff Gordon? I give up!

Regards,
DiscoEd


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Offline seaweb11

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Re: front brake question
« Reply #8 on: November 21, 2005, 09:22:27 PM »
My rebuilt piston is hollow now so I took mine out.
It squeals.....what ever......
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eldar

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Re: front brake question
« Reply #9 on: November 22, 2005, 08:28:18 AM »
It does 2 things: Helps keep the puck straight and some pucks have a bulge on the inside that would otherwise rest against the piston and could throw it off. It helps absorb some frequency vibration which causes squealing. It is not a required part and you could probably use a couple of rubber coated washers in place of it if you can find them, or you could use nothing at all.

All I can say is, I use it and I do not have much squeal and my pads wear as even as 27 year old design can.
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