Z3m calipers retrofitting

UK forum for general and technical discussion about the Z3 roadster

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zz3po
Joined: Sun 30 Aug, 2015 10:31
Posts: 75

  Z3 roadster 1.8

Z3m calipers retrofitting

Post by zz3po » Sat 10 Mar, 2018 00:03

hi everyone
I have 1.8 z3
And thinking about retrofitting z3m calipers.
Any changes i have to do beside the calipers or its a direct fit?
Thanks alot.

Hendem03876
Joined: Fri 11 Aug, 2017 00:32
Posts: 3

  Z3 roadster 1.9

Re: Z3m calipers retrofitting

Post by Hendem03876 » Sat 10 Mar, 2018 00:05

What year each

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zz3po
Joined: Sun 30 Aug, 2015 10:31
Posts: 75

  Z3 roadster 1.8

Re: Z3m calipers retrofitting

Post by zz3po » Sat 10 Mar, 2018 17:00

Hi
Mine (1.8) is 97
Id like to take the calipers from 98 M roadster.

NZ00Z3
Joined: Thu 23 Jun, 2016 02:26
Posts: 68

  Z3 roadster 3.0i

Re: Z3m calipers retrofitting

Post by NZ00Z3 » Sun 11 Mar, 2018 23:03

Hi

There's a bit more involved than just changing the caliper.

The Z3M caliper has 60/28 stamped on it which means that it has a 60 mm piston and designed for 28 mm thick disks. Plus the disk is 315 mm in diameter.

Your 1.9 L Z3 has a 54/12 caliper and 286 mm diameter disks.

To fit the Z3M caliper, you need to fit the Z3M disk which leads to fitting the Z3M caliper carrier, which may not fit the non M hub. Plus you need to consider if your master cylinder can drive the larger 60 mm piston in the Z3M caliper and how it will affect brake bias.

The usual brake upgrades for the 1.9 L Z3 are:
- Fit face lift model ventilated disks, carrier and calipers, same size piston and disk, just keep cool better.
- Fit 3.0 L Z3 carriers, calipers and disks. 300 mm disks, same size pistons

These two options have been designed by BMW for the Z3, so they will be safe.

Brakes are a major safety system in the car, so you need to check your local laws etc on what you are allowed to change and whats needs some sort of certification.

Hope that helps.

Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 70

  Z3 roadster 2.8

Re: Z3m calipers retrofitting

Post by Juvvajuvva » Mon 12 Mar, 2018 03:54

The Z3M king pins are different, so you need them.Basically buy the entire legs,calipers,king pins,hubs,bearings,disc protection plates,,anti roll bar, drop links ,the lot.

Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 70

  Z3 roadster 2.8

Re: Z3m calipers retrofitting

Post by Juvvajuvva » Mon 12 Mar, 2018 03:58

And the discs of course. As for bias and such like. I have gone from 275 mm front discs with single piston calipers to 365mm discs with 6 piston calipers with no ill effects in the past and the car does not swap ends.

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