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brake caliper rebuild

Well I have the engine out and was going to either put cams in or a rarlyl8 header but with all the other car costs going on I don't have the money so I may do the ice needed brakes.
My front rotors are worn out and last time I had the pads out the calipers needed some attention. So I thought a rebuild is due.

I don't see much on here about the 930 caliper rebuild. Is there anything special I need to know other than I can't believe the rebuild kit is as much as the rotor.

What about pads.
The mentex on there now are crap. 2 or 3 hard stops and they are gone. Brake fade. I had some hawk pads on there but the dust was very very bad for the wheels.

Also need to replace out CV boot. Is the $4 boot on Pelican any good.

Also found a shop here that will make new lines for the AC for $4 per ft plus fittings. I hope he can get the ones I need.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:

Last edited by T77911S; 08-20-2015 at 02:42 PM..
Old 08-20-2015, 02:34 PM
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Hawk hps great stopping minimal dust
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88 930 3.4 ,Twin plugged billet Xtreme cylinder heads and denso COPs, Dougherty custom GT 2 evo cams,pauter rods,Garrett Gt40,ms3x Efi ,1100cc injectors,extrude honed 3.2 intake,TK billet fullbay I/C,MODE headers,KEP stage 2,E-85 706 rwhp
Old 08-20-2015, 02:42 PM
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Ty,
I had posted up a few years ago on my front caliper rebuild, pad swap and new rotors. Not an unpleasant task as these cars go, and it really was a nice improvement. Not cheap but that goes without saying doesn't it...
Just rebuilt my front calipers
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1986 930, 1969 Mach1, 2003 540 Sport, 2016 R1200RS
Old 08-20-2015, 04:55 PM
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I'd consider getting new pistons for the brakes along with the new seals and scraper rings during the rebuild.

I rebuilt my front calipers with only the new seals and scraper rings. I cleaned up the old pistons very well, but after the rebuild I had a small/intermittent fluid leak from one of the Pistons. I can't be sure that a worn piston was the culprit, but it's the only thing that wasn't new.
Old 08-21-2015, 02:20 AM
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Quote:
Originally Posted by gsxrken View Post
Ty,
I had posted up a few years ago on my front caliper rebuild, pad swap and new rotors. Not an unpleasant task as these cars go, and it really was a nice improvement. Not cheap but that goes without saying doesn't it...
Just rebuilt my front calipers
$400 FOR SEALS FOR BOTH CALIPERS!!!! you ahve got to be kidding me. i thought 1 $100 kit did one complete caliper. i may have to take another look at my calipers.
i have one that locks up before the other and frmo what i remember some sticky pistons. also, the brakes on my 77s performed better than these, but i think mostly due to the pads. even with cheap mentex pads on the 77 if i was not buckled in and i braked hard, unless i braced myself my weight sliding forward would just keep applying more brake pressure, not to mention the initial grab was much better.

maybe i will just rotors all around and pads.
i was looking at the cool carbons.
the hawk pads i have on there messed up my wheels.

i usually pop the pistons most of the way out before removing the caliper. the brake system has more pressure than air.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-21-2015, 05:30 AM
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I think I used Cool Carbon, and my right frt locks up first. Not related, as it did this before I changed to CC.
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Old 08-21-2015, 07:18 AM
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A good corner balance radically helps with the front one-or-the-other wheel lock up issue.

Rebuilding the calipers is easy and straight forward.

I bought all of my rebuld kits from our host about 2 years ago, was not anywhere near the cost you are posting...Look again with our host before you buy elsewhere!

Mark

Last edited by full quack; 08-21-2015 at 08:14 AM..
Old 08-21-2015, 08:12 AM
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I did a write up for a magazine on rebuilding 930 calipers if you do go through it...very straight forward...and yes it is not cheap...buy quality replacements...

https://pcapotomac.org/attachments/article/117/NovemberdV2013.pdf
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1979 930 - Black on Black and in the woods

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Old 08-21-2015, 08:41 AM
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nice article. just did not know if there was anything special about the 930 calipers.
the kits here are for one caliper. i will still take a look at the calipers again to see if they need it.

my brake fluid is blue. i see here they use to sell a blue brake fluid but it is NLA. guess it will all have to flushed out if i use something different.
any suggestions
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-21-2015, 09:00 AM
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The alternate colors are nice, in that you know when you have flushed....
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1986 930
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Old 08-21-2015, 09:11 AM
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Amazon.com: ATE 706202 Original TYP 200 DOT 4 Brake Fluid - 1 Liter: Automotive
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1986 930
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Old 08-21-2015, 09:35 AM
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highly recommend the gold plus as TIMC said...You will know when you have performed a complete flush... Remember to start from the furthest from the master cylinder and work your way to it...
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1979 930 - Black on Black and in the woods

"My third child that will cost more in the long run" :shock:
Old 08-21-2015, 09:48 AM
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glad I saw this. just getting into a full project on a 78 930 clone.

found a good set of used 930 calipers, and plan to rebuild.

I have rebuilt other calipers.
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Old 08-22-2015, 06:05 AM
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Calipers seem ok.
Got my front rotors. Waiting on pads. Got the hubs off and found rear s a also dried up. Got everything cleaned up. Need to order seals and get grease to repack.
What grease to use on bearings.
also had to replace CV boot. Bought a pair of the clamp pliers from advance for $10. A little cumbersome but they worked.

Perhaps too many projects.
Engine out, replacing AC, CV repair, front brakes
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-30-2015, 05:46 PM
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also replac ing rubber lines.....if i can get them.
but i may have found one thing that could be causing one side to lock up first.
with the brake calipers off, fluid drains out of the left side much much faster than the right.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 08-31-2015, 05:01 AM
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I have an '86 930 and noticed the passenger front caliper was sticking and the car pulled to that side.

I've replaced the seals and scaper rings. I followed the rebuild that Scott detailed in the magazine a few posts back.

Cleaned everything very well; scotchbrited the pistons put everything back together.

Rebuilt the driver side front caliper too.

I didn't use the caliper grease, only brake fluid as detailed in Scott's write up.

Now the passenger front caliper is dragging a bit but braking is ok and the car doesn't pull anymore.

What could still be wrong with the caliper? The pistons looked ok with no corrosion. Should I have used the caliper grease?

I don't want to buy new pistons if they're not at issue.

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Old 11-22-2017, 07:34 AM
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I did replace the flexible lines on both fronts.

I chatted with Eric from PMB. He thinks there might be some binding with in the bores. He uses assembly lube on his restores. I think I'll remove the caliper and pop the pistons out, inspect for binding, and reinstall the pistons using assembly lube.
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Old 11-29-2017, 12:01 PM
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that's what I should have done to begin with. I did not realize how bad the binding was with the new seals. so I think my old seals were still good, just needed a lube job. (rawknees just perked up).

BTW, both fronts locked up on me the other day, and at the same time. use to be one would go first.
yea, I stayed in it too long plus bad tires. over shot the turn and thought I was going for a ride in the grass. still put half the car in the grass and sideways. rears are worse than fronts and I new I had no chance if I did not scrub more speed.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 11-30-2017, 03:20 AM
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If you still got old rubber brake lines and uneven braking, pay to replace. Braided best. The teardown is not complicated - as you prob found out. Don't over think it - as you keep telling me :-)
Regards
Alan
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Old 12-01-2017, 12:34 AM
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brakes are fine. actually left a nice even skid mark on the road here at work.
replaced rubber lines last year when I did all this work.

talked to my brother last night about his. he has one that locks up first. I think he is going to do what I should have done, take then apart and just apply assy lube to get the pistons moving.

my original problem was when I had the calipers off, with air pressure all 4 pistons were not popping out at the same time. some would be slower than others.
the lube should get all 4 moving at the same time.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 12-01-2017, 03:13 AM
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