Where to get a new master brake cylinder?

[RickMcRick]

I think my master brake cylinder is on it's way out. Pedal went to the floor the other day but then continued to work normally.

I want to replace it with a new one rather than second hand, maybe a refurb at a push.

I've had a look on ebay, camskills and fensport but nothing is coming up (other than second hand on ebay).

Anyone know where to get one new? Or is it a Mr T. job?

It's for a rev 3 turbo, but I doubt that's relevant as I assume if they sell one they will sell them all.

[craig]

I've got one from a rev3 turbo that was working perfect before I started breaking the car.

[synXero]

Can I jump in on this topic and ask - if I'm fitting 4 pot calipers up front, should I be replacing the master cylinder with a stronger / newer unit?

[RickMcRick]

Can I jump in on this topic and ask - if I'm fitting 4 pot calipers up front, should I be replacing the master cylinder with a stronger / newer unit?

I'm only speaking from word of mouth, so hopefully someone else will confirm. I believe that the stock will work fine, but as the 4 pot callipers will use more fluid you will get the low fluid warning light when you use the brakes until you fit a larger reservoir.

[RickMcRick]

I've got one from a rev3 turbo that was working perfect before I started breaking the car.

I think I'd be more comfortable with a new one as it will have more life left in it than a second hand. But, how much would you be looking for for it?

[gazrev1tubby]

Rick, i'm pretty sure I have a rev3 one kicking around too. It's obviously second hand, but if you want it, just cover the postage

Is yours abs or not though?

[Peter Gidden]

Absolutely no reason to think about buying new. And IIRC they're about £300.

Either fit an overhaul kit to yours, or if you so desire, buy another from an IMOC member and overhaul that one. What makes you think yours is damaged and needs replacing? It will most likely be the seals which have failed with age. There is a reason why every car manufacturer sells cylinder overhaul kits....

FWIW, i personally have never had to fit a BNIB master cylinder, and i know of no specialist that has either.

[RickMcRick]

Cheers Gaz, I'll drop you a message if a new one is ridiculously priced

Mine is a non abs btw.

[RickMcRick]

Wrote the above before seeing Peter's reply.

If it's the case they are £300 then I'll go with the overhaul kit.

I wanted new so I didn't have the worry of a second hand unit being a bit of a wild card weather it would last months or years before going the same way.

Cheers for all the replies guys.

[bobhatton]

Can I jump in on this topic and ask - if I'm fitting 4 pot calipers up front, should I be replacing the master cylinder with a stronger / newer unit?

If you are only going to fit front ones your braking is going to be well out of balance.
The rear brakes do so much more work on the MR2 than any front engined car so you should be fitting a complete designed and tested kit for all 4 wheels

[badgerbob]

bought one last year from my local motor factors for £35.... not sure where you guys are getting £300 from etc

and yup thats new, i dont mind ordering you one for a small fee

[synXero]

Can I jump in on this topic and ask - if I'm fitting 4 pot calipers up front, should I be replacing the master cylinder with a stronger / newer unit?

If you are only going to fit front ones your braking is going to be well out of balance.
The rear brakes do so much more work on the MR2 than any front engined car so you should be fitting a complete designed and tested kit for all 4 wheels

I'm doing larger discs on the rear and a spaces out caliper, it's the best that's commonly available. If I could mess about with a bias valve that would be fun, but not sure if this is possible.

[RickMcRick]

bought one last year from my local motor factors for £35.... not sure where you guys are getting £300 from etc

and yup thats new, i dont mind ordering you one for a small fee

Cheers dude, I'll look 'em up.

[badgerbob]

no worries bud, this is the company i actually used http://www.cobramotorcomponents.co.uk/

[toxo]

New from Mr T is £250 give or take (for rev3 turbo non-ABS). At least it was 2 years ago

[synXero]

Can I jump in on this topic and ask - if I'm fitting 4 pot calipers up front, should I be replacing the master cylinder with a stronger / newer unit?

I'm only speaking from word of mouth, so hopefully someone else will confirm. I believe that the stock will work fine, but as the 4 pot callipers will use more fluid you will get the low fluid warning light when you use the brakes until you fit a larger reservoir.

A larger reservoir... I haven't heard this before so would be interested to find out a bit more.

[toxo]

Well first you'd need to prove that your 4 pot calipers used more fluid to create the same clamping pressure than your 2 pot calipers. Many smaller pistons is more efficient than one or two large ones, so if you have well designed 4 pots you might actually need less fluid pressure to create an equivalent braking force.

[synXero]

Well first you'd need to prove that your 4 pot calipers used more fluid to create the same clamping pressure than your 2 pot calipers. Many smaller pistons is more efficient than one or two large ones, so if you have well designed 4 pots you might actually need less fluid pressure to create an equivalent braking force.

How well designed are R34GTT calipers then? I have done absolutely no testing regarding this yet, and they're nowhere near the car yet either. I am hesitant to install them too hastily.

[raptor95GTS]

Well first you'd need to prove that your 4 pot calipers used more fluid to create the same clamping pressure than your 2 pot calipers. Many smaller pistons is more efficient than one or two large ones, so if you have well designed 4 pots you might actually need less fluid pressure to create an equivalent braking force.

How well designed are R34GTT calipers then? I have done absolutely no testing regarding this yet, and they're nowhere near the car yet either. I am hesitant to install them too hastily.

er what calipers did you get?? Is this for Gaz's kit as the Nissan units are a bit different between the skyline range - I found this out to my cost with a pair of ECR33 Nissan Skyline GTS-T (RB25DET) calipers and they were the wrong ones. Didn't fit the brackets I had (not Gaz's but based on same original Global Z design) as the height of the legs and spacing was way out

[synXero]

Well first you'd need to prove that your 4 pot calipers used more fluid to create the same clamping pressure than your 2 pot calipers. Many smaller pistons is more efficient than one or two large ones, so if you have well designed 4 pots you might actually need less fluid pressure to create an equivalent braking force.

How well designed are R34GTT calipers then? I have done absolutely no testing regarding this yet, and they're nowhere near the car yet either. I am hesitant to install them too hastily.

er what calipers did you get?? Is this for Gaz's kit as the Nissan units are a bit different between the skyline range - I found this out to my cost with a pair of ECR33 Nissan Skyline GTS-T (RB25DET) calipers and they were the wrong ones. Didn't fit the brackets I had (not Gaz's but based on same original Global Z design) as the height of the legs and spacing was way out

I also bought s14 calipers. I had the opportunity to line the legs up. They are a match. The only issue I could see was that the bolt holes are 14mm rather than 12mm. I suspect the adapters could be redrilled. They were at the same 100mm approx centres. I will do a more comprehensive comparison :thumbleft: