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Old 07-30-2012, 11:17 PM   #1
hellmet
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Default frustrated rear brake help

77 fxe rear disk brake not releasing getting hot. took everything apart. new master with dot 5 rear caliper nice n clean not guncked up. im just wondering if all the right parts are in there. anyone have a good detailed break down? i have a book but want another opion. thanks billy

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Old 07-30-2012, 11:51 PM   #2
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Default Re: frustrated rear break help

hellmet, pull the calaper and make sure its not hanging up.
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Old 07-30-2012, 11:59 PM   #3
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Default Re: frustrated rear break help

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Originally Posted by hellmet View Post
77 fxe rear disk break not releasing getting hot. took everything apart. new master with dot 5 rear caliper nice n clean not guncked up. im just wondering if all the right parts are in there. anyone have a good detailed break down? i have a book but want another opion. thanks billy
Had that same problem, ended up being the master cylinder.
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Old 07-31-2012, 12:03 AM   #4
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Default Re: frustrated rear break help

i did . im just wondering if its binding should it float on the pins? i notice the brake housing it tight the back half comes off when the bolts are out but the face stays on have to pry it loose it sets on the spring
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Old 07-31-2012, 12:06 AM   #5
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Default Re: frustrated rear break help

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Originally Posted by 52pan View Post
Had that same problem, ended up being the master cylinder.
its all new i even took it apart and checked it
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Old 07-31-2012, 12:59 AM   #6
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Default Re: frustrated rear break help

its all new ... whats the brake light say ?
if the brake switch is still under presure after the pedals released there may be restriction on the line
if switch acts normal then thered have to be some thing going on in the caliper
is it centred over the disc or is there a spacer missing to go between the disc and hub ?
are the pads holding on 1 side ?
if its single piston it should slide
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Old 07-31-2012, 01:02 AM   #7
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Default Re: frustrated rear brake help

it is single piston whats the spacer look like . ill go take a pick
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Old 07-31-2012, 01:16 AM   #8
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Default Re: frustrated rear brake help

ok went out and pumped the brake the piston went up but didnt go back down i took the mc cap off and the brake fluid is shooting up when i pumped it.
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Old 07-31-2012, 01:58 AM   #9
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Default Re: frustrated rear brake help

Looks like you are missing the black insulating puck that sits in the caliper piston. In the past I have cut off wooden dowel for a temp fix. The brake worked again, and was still working fine when I replaced it with the stock part

Last edited by 45.; 07-31-2012 at 02:05 AM.
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Old 07-31-2012, 05:27 AM   #10
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Default Re: frustrated rear brake help

the spacer I was on about is a disc that goes behind the brake rotor against the wheel hub = 1976 to 1980 ...its got 5 holes in it lining up with the bolts ,about 4.5 " dia ,its in the manual pic

Im only guessing the far side pad has all the presure on it

Ive got PM brakes and they come with little spacers also ,its the same ol tech diff brand
Ive read on JJ before about the fountain = try any searches?
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Old 07-31-2012, 06:40 AM   #11
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Default Re: frustrated rear brake help

If the mc piston is not coming fully back to the stop clip in the mc, the fluid pressure can not be relieved. So make sure it is, and, just to be sure, make sure both holes in the mc are open. Also, if your brake lines are old, you could have a restriction flap, from deteriation and age. If the caliper is moving in and out, with ease, then it is probably not the caliper.
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Old 07-31-2012, 09:46 AM   #12
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Default Re: frustrated rear brake help

any pics of spacer? it never had the puck between the pad and piston.
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Old 07-31-2012, 12:10 PM   #13
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Default Re: frustrated rear brake help

The Insulator "puck" as I call it, was not stock until late 78, have you replaced the Brake Pads yet?
The Brake Caliper Piston does not return automatically when not installed on the bike. It must be manually pushed back in with a C Clamp.
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Old 07-31-2012, 01:26 PM   #14
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Default Re: frustrated rear brake help

Have you used this yourself in the past, and now your having trouble? The reason I ask is, I bought a "used" caliper, put it on, bled it fine, and rode about a mile and it almost locked up. Serious drag on the disk. I let it cool and was able to limp home. I got some advice that maybe DOT 3 was mixed with DOT 5, and that caused it. I use DOT 5. I cleaned the lines and caliper and MC with denatured alchohol, put everything back together and all was fine. So I assumed the caliper had DOT 3 in it from the PO and
when I put the DOT 5 in, it caused the problem.

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Old 07-31-2012, 11:07 PM   #15
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Default Re: frustrated rear brake help

http://www.retrocycle.com/CustomChro...or_Spacer.html
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Old 08-01-2012, 07:54 PM   #16
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Default Re: frustrated rear brake help

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Have you used this yourself in the past, and now your having trouble? The reason I ask is, I bought a "used" caliper, put it on, bled it fine, and rode about a mile and it almost locked up. Serious drag on the disk. I let it cool and was able to limp home. I got some advice that maybe DOT 3 was mixed with DOT 5, and that caused it. I use DOT 5. I cleaned the lines and caliper and MC with denatured alchohol, put everything back together and all was fine. So I assumed the caliper had DOT 3 in it from the PO and
when I put the DOT 5 in, it caused the problem.

Sixball
If you want to see a brake fluid "Lava Light" liquid. Pour some 3 in a clear jar, and then pour some 5 in behind it. I have had this same problem in the past, and I agree, it really does wierd stuff to the brake system. Like water and oil.
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Old 08-02-2012, 08:46 AM   #17
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Default Re: frustrated rear brake help

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any pics of spacer? it never had the puck between the pad and piston.
For a 78 but I think this should be close to your 77

SJ
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Old 08-02-2012, 09:05 AM   #18
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Default Re: frustrated rear brake help

Are you tightening the two halves of the caliper together to tightly? Just another thought.
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Old 08-02-2012, 12:24 PM   #19
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Default Re: frustrated rear brake help

Sorry for not gettin back, puter was down for a little while. Yes the callaper should "float" on the pins, this is how it centers it's self. Take some emerycloth and clean and lightly lube them, 3in1 is good for the pins. Take a c-clamp and slowly compress the piston in the calaper with the top of the master cylinder off and watch to see if the fluid is returning, like Shovit said, if ya have a torn iner line, it will shut off the flow returning.
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Old 08-03-2012, 12:47 AM   #20
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Default Re: frustrated rear brake help

it has the russle bradid line on it.
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