Front brake discs not looking good

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mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Front brake discs not looking good

Post by mrscalex » Wed 22 Jun, 2016 22:50

No expert on brakes so need some second opinions here. Starting to look at the mechanicals on the 2.2 project ready for MOT. Remembering this car has not run for about 9 months and I've never driven it as it arrived by transporter.

On the outside surface of the front discs there's a badly corroded outer ring where presumably the pad isn't touching. On the inside surface that ring is much wider and together with an inner ring about 50% of the disc does not appear to be in contact with the pad. The pads appear to have plenty of thickness left.

Now I don't need to be told a new pair of discs would be advisable. And quite probably a new set of pads for good measure.

But what I'd like to understand is why the discs have ended up like that. Is it a pointer to the calliper pistons being partially seized?

The rear discs look fine and just have a surface coating of rust consistent with standing around.

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1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

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stevov
Joined: Sun 21 Dec, 2014 15:56
Posts: 167

  Z3 roadster 2.0
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Re: Front brake discs not looking good

Post by stevov » Thu 23 Jun, 2016 07:31

Strip and clean and check for piston smooth travel definitely advised. Replace discs. The pad wear pattern on the outside, especially the excessively wide outer corroded ring indicates a budget pad where pad material widths get reduced to bring down costs. The inner wear I see every day. A result of poor maintenance, one or both sliders sticking, piston sticking.

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Front brake discs not looking good

Post by mrscalex » Thu 23 Jun, 2016 07:54

stevov wrote:Strip and clean and check for piston smooth travel definitely advised. Replace discs. The pad wear pattern on the outside, especially the excessively wide outer corroded ring indicates a budget pad where pad material widths get reduced to bring down costs. The inner wear I see every day. A result of poor maintenance, one or both sliders sticking, piston sticking.
Thank you. When you say slider - what does that mean? Can the piston be taken out and cleaned/serviced in any way?
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

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stevov
Joined: Sun 21 Dec, 2014 15:56
Posts: 167

  Z3 roadster 2.0
Contact:

Re: Front brake discs not looking good

Post by stevov » Thu 23 Jun, 2016 08:51

Sliders are the pins top and bottom that the caliper moves in and out on. The caliper itself can be rebuild. Kits available to reseal the piston and new dirt seals. Often the piston is corroded, can be replaced but I have found over the years for bog standard generic calipers just replace with reconditioned from eurocar parts or the like. Quick easy and warranty.

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Front brake discs not looking good

Post by mrscalex » Thu 23 Jun, 2016 13:05

stevov wrote:Sliders are the pins top and bottom that the caliper moves in and out on. The caliper itself can be rebuild. Kits available to reseal the piston and new dirt seals. Often the piston is corroded, can be replaced but I have found over the years for bog standard generic calipers just replace with reconditioned from eurocar parts or the like. Quick easy and warranty.
Thanks stevov. I just need a nudge in the right direction normally and I can take it from there. Plus it helps me to keep my to do list and budget realistic and updated :)

Looks like I might need up to a couple of hundred quid worst case with the calipers, discs and pads from Eurocarparts. But as I'm a skinflint I might try the rebuild kit :)
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

bertiejaffa
Joined: Fri 26 Jul, 2013 10:28
Posts: 1715

  M roadster S50
Location: Manchester

Re: Front brake discs not looking good

Post by bertiejaffa » Thu 23 Jun, 2016 23:22

biggred do great refurb kits for calipers, seals, sliders and pistons. for discs eurocarparts will be fine if you want standard good and affordable
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Bonzo
Joined: Wed 21 Mar, 2012 21:52
Posts: 859

  Z3 roadster 2.8
Location: Norfolk

Re: Front brake discs not looking good

Post by Bonzo » Fri 24 Jun, 2016 11:12

Don't forget you get money back if you take your old calipers to ECP, provided of course you buy your new ones from them. I did this!
Z3lda (Zelda), 1998 2.8, Montreal Blue, Beige Oregon leather interior and M steering wheel, Sports Seats, Wood trim, Chrome Line Interior, Centre armrest with Cupholder, Alpina Softline wheels, Chromed Angel Eyes, De- tango'd, Rear stone guards, Sport aerial, ASC front strut brace, Strong Strut Butt Strut and Body Brace, Uprated brake fluid, Yellowstuff pads 78k.

mrscalex
Joined: Fri 13 Mar, 2015 09:14
Posts: 795

  Z3 roadster 1.9

Re: Front brake discs not looking good

Post by mrscalex » Fri 24 Jun, 2016 11:16

Bonzo wrote:Don't forget you get money back if you take your old calipers to ECP, provided of course you buy your new ones from them. I did this!
Good point. Didn't see the surcharge clause though so price remains at the £67.99 per side I originally bargained for. I think they do global 20% (?) discount days from time to time so will be waiting for one of those if I can. The V5 will still be another 3 weeks from DVLA as it was destroyed/lost so no rush!
ImageImage
1999 Z3 1.9 Boston Green (Dimitri) - My brother's car owned from new and restored by me
2001 Z3 2.2 Topaz Blue (Trudy) - My car rebuilt from a write-off
2002 Z3 2.2 Titan Silver (Okus) - Project car waiting for a new engine
2001 Z3 2.2 Topaz Blue (Debra) - Donor car/breaker
1998 Z3 1.9 Boston Green (Allsworth) - Donor car/breaker now gone to Z3 heaven
Always happy to try and help with spares :)

bertiejaffa
Joined: Fri 26 Jul, 2013 10:28
Posts: 1715

  M roadster S50
Location: Manchester

Re: Front brake discs not looking good

Post by bertiejaffa » Fri 24 Jun, 2016 14:07

mrscalex wrote:
Bonzo wrote:Don't forget you get money back if you take your old calipers to ECP, provided of course you buy your new ones from them. I did this!
Good point. Didn't see the surcharge clause though so price remains at the £67.99 per side I originally bargained for. I think they do global 20% (?) discount days from time to time so will be waiting for one of those if I can. The V5 will still be another 3 weeks from DVLA as it was destroyed/lost so no rush!
And money back through quidco
Here come the girls.....
Image
My //M Refurb
My First Zed Journal

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