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Brake calipers question

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BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Brake calipers question

Post by BMWFanatic2008 » Wed Feb 07, 2018 1:12 am

Hey guys,

My driver's side rear brake caliper started leaking brake fluid. I took the car to a local mechanic and he recommended replacing it. He isn't sure if it can be rebuilt due to its age/rust.

I looked up the part number and it's 34211119211 (my car was built before 9/82). Any idea where I can purchase a rebuilt one? The new ones are expensive, around $300.

Also, do you think I can fit one from 82+ model (will replace both sides in this case)? I found plenty of those available at a reasonably price.

Thanks in advance,
Andy

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Brucey
6 Series Guru
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Joined: Fri Apr 09, 2004 7:17 am
Location: Cambridge, UK

Re: Brake calipers question

Post by Brucey » Thu Feb 08, 2018 5:15 pm

the later caliper won't fit over your disc. There are parts bin options for converting both disc and caliper to a different spec but I would suggest that you stick with the standard (E12 chassis) fitment if you can.

IIRC the calipers use a piston size and seal/boot design that is common to other calipers so you ought to be able to get the caliper rebuilt or exchanged without having to buy a new one.

A seal kit is likely to be just a few quid if you fancy DIY and here in the UK companies like Bigg Red offer exchange rebuilt calipers at reasonable cost.

cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Re: Brake calipers question

Post by BMWFanatic2008 » Thu Feb 08, 2018 10:27 pm

Brucey wrote:
Thu Feb 08, 2018 5:15 pm
the later caliper won't fit over your disc. There are parts bin options for converting both disc and caliper to a different spec but I would suggest that you stick with the standard (E12 chassis) fitment if you can.

IIRC the calipers use a piston size and seal/boot design that is common to other calipers so you ought to be able to get the caliper rebuilt or exchanged without having to buy a new one.

A seal kit is likely to be just a few quid if you fancy DIY and here in the UK companies like Bigg Red offer exchange rebuilt calipers at reasonable cost.

cheers
I see, thanks for the info. I will keep looking for a refurb. one then.

BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Re: Brake calipers question

Post by BMWFanatic2008 » Wed Mar 07, 2018 11:56 pm

Ended up rebuilding the rear brakes myself. The pistons were completely seized on one of the brakes so only one side was working. Will be doing the fronts next. Took a bit of time to find the correct replacement parts for e12 based brakes but the result was well worth it :D

Here is what I had to buy:
Brake caliper repair kits
Brake pads
Brake wear sensors
Pins and brackets
Paint

Big thanks to this forum (found a couple of very useful DIYs on here).
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Brucey
6 Series Guru
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Joined: Fri Apr 09, 2004 7:17 am
Location: Cambridge, UK

Re: Brake calipers question

Post by Brucey » Thu Mar 08, 2018 10:28 am

looks good!

cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Re: Brake calipers question

Post by BMWFanatic2008 » Tue May 15, 2018 12:07 pm

Hey guys,

I have a follow-up question re: brakes. I am looking to purchase a brake lines kit for my car. I found a few listings on ebay for APEX kits. Do e24s based on e12 chassis and the ones based on e28 chassis share the same brake lines? The ebay seller is offering the same kit for all 633 model years (78-84). I know the brake calipers are different so wanted to make sure. I have pre-82 production 633.

Anything else I should consider / purchase for this job?

Thanks.

GRNSHRK
E12 Based Guru
Posts: 2450
Joined: Thu Apr 08, 2004 3:24 pm
Location: Sunnyvale (SF Bay Area) CA

Re: Brake calipers question

Post by GRNSHRK » Tue May 15, 2018 3:37 pm

That doesn't sound right, fanatic [-X

The E12 front brakes are 4 piston fixed calipers, but the E28 does not =;

Dang, thought you could see the 2X lines going to the caliper in this photo, but you can see the 2 rigid/fixed pipes :roll:

Think I would continue your search :-({|=
Attachments
Front Brakes-sm.jpg
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:mrgreen:
Bobbo
1980 633 CSi
Cypress Green/Pearl Beige
2011 F10 528i
2005 E46 330 Ci ZHP Cabrio
Image

You can never have too many BMW's

BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Re: Brake calipers question

Post by BMWFanatic2008 » Tue May 15, 2018 5:37 pm

GRNSHRK wrote:
Tue May 15, 2018 3:37 pm
The E12 front brakes are 4 piston fixed calipers, but the E28 does not =;
Hi GRNSHRK,

So E28 based front brakes have only 2 pistons? The kit comes with 6 lines according to their description. I assume that's a good indicator that it's for E12 based car?

GRNSHRK
E12 Based Guru
Posts: 2450
Joined: Thu Apr 08, 2004 3:24 pm
Location: Sunnyvale (SF Bay Area) CA

Re: Brake calipers question

Post by GRNSHRK » Tue May 15, 2018 6:33 pm

I think the E28 calipers (front and rear) are only single piston floating type :-?

But looking at your rebuild photos of the rear, I can now see that those are indeed E12 calipers, which are actually 2 piston fixed type =D>

Bottom line, the correct kit should have a total of 6 lines for the E12 chassis [-o<

It's possible that this seller throws in enough for both E12 and E28 chassis, but I have no idea if the fittings are the same, lengths are compatible, etc. :-?

BTW, nice rebuild job in your photos \:D/

Here's a shot of mine #-o
Attachments
Rear Brakes.jpg
Rear Brakes.jpg (607.53 KiB) Viewed 161 times
:mrgreen:
Bobbo
1980 633 CSi
Cypress Green/Pearl Beige
2011 F10 528i
2005 E46 330 Ci ZHP Cabrio
Image

You can never have too many BMW's

BMWFanatic2008
Posts: 15
Joined: Mon Feb 05, 2018 4:02 am
Location: New York

Re: Brake calipers question

Post by BMWFanatic2008 » Wed May 16, 2018 12:49 am

GRNSHRK wrote:
Tue May 15, 2018 6:33 pm
I think the E28 calipers (front and rear) are only single piston floating type :-?

But looking at your rebuild photos of the rear, I can now see that those are indeed E12 calipers, which are actually 2 piston fixed type =D>

Bottom line, the correct kit should have a total of 6 lines for the E12 chassis [-o<

It's possible that this seller throws in enough for both E12 and E28 chassis, but I have no idea if the fittings are the same, lengths are compatible, etc. :-?

BTW, nice rebuild job in your photos \:D/

Here's a shot of mine #-o
I see, thanks for the info. I think I will take a chance and risk $60 and if it doesn't fit, I will return it. A few other kits that I saw are a lot more expensive.

Very nice setup you got! Hopefully mine will look the same at some point in the near future.

GRNSHRK
E12 Based Guru
Posts: 2450
Joined: Thu Apr 08, 2004 3:24 pm
Location: Sunnyvale (SF Bay Area) CA

Re: Brake calipers question

Post by GRNSHRK » Wed May 16, 2018 3:33 pm

Thanks :lol:

The caliper paint has held up very well, can't say the same for the rotors, which of course have rusted where the pads do not contact them :oops:

Good luck with your project, please post pix when she's complete [-o<
:mrgreen:
Bobbo
1980 633 CSi
Cypress Green/Pearl Beige
2011 F10 528i
2005 E46 330 Ci ZHP Cabrio
Image

You can never have too many BMW's

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