What size rear wheel cylinders to use with Minisport 4 pots?
Turbo Mini Forums

Folks, I'm having issues with my brakes in the fact that the pedal travels too far... after speaking to a mate we wondered if it could be the rear wheel cylinders being too big and they are using up all the pedal travel.

What size rear wheel cylinders are you guys using on minisport 4 pots?

My system is a single line and its all brand new with no servo.

Ta

as long as the rears are adjusted ok it shuldnt be a problem, my front callipers have huge pistons and the pedals fine.

Is the system bled properly? And are the front callers on the correct way? Ie is the bleed nipple at the top of the caliper?

stick some 1275GT cylinders on the backs and i bet you see a massive differance n pedal travel. I run Fiesta 1 pots fronts and I stuck some 1275 GT RWC on and the pedal is now right there...

It might be worth checking the bleeding as reading about on forums 4 pots can be a pain to bleed...

Edited by gr4h4m on 21st Jul, 2012.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

these are the chappies

http://www.minispares.com/product/Classic/...k%20to%20search

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Or:- http://www.minisport.com/mini-spare-parts/info_GWC1126.html

If something is worth doing, it's worth doing half of.

Thats what I used. The 3/4" ones locked the rears first even with a bias valve.

Cheers guys, I will try some of those cylinders... the ones that are on came on the backplates built up from minisport so I am not sure what size they are?

We've bled the brakes 5 times now, the nipples on the calipers are at the top.

The front pads are now binding on the discs so I don't think its a problem with the front...

What are the bleeding issues you've heard of gr4h4m?

Some people put them upside down, which you havent and dont some of them have a nipple top and bottom? Not sure but seem to see a few post with people complaining.

You seem to be on top of it? hows your pedal when you get one - Stiff?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I've got mini spares four pots, with mini spares ready built back brakes, they are the smaller width shoes, I think 1.1/4, with servo and my brakes are good with very little peddle travel..

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Also if they are the same calipers as mine they have two bleed nipples on each side..

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Sorry Mate miss read your post, yours are minisport.

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I have had this happen. bled the brakes until i was blue in the face .still no firm pedal.was shown how to fix that as the way described in the book of lies did not do anything
the master has not too much volume and due to the long throw of the rear cylinders you run out of pedal movement fast

have you tried adjusting the rear brakes until fully stuck hard ? the pedal should be feeling firm (if not you have a master cylinder problem or the pressure reduce thing in the rear is running amok) . then use a big rubber hammer or wooden block and bfh and vigorously pound the drum around the circumference. most of the time it will be quite loose again . re adjust until stuck again and repeat a few times until it does not loosen up after pounding.quite a bit of drag is imho ok do a few hard stops forward and in reverse and check if the drum heats up too much after a bit of driving . hope this helps

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

Cheers guys,

Just spoken to minisport and their back plates are built up with 3/4 inch wheel cylinders...

Some times you have to bleed master cylinder..

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Its a single line system with no other jiggery pokery to speak of other than the master cylinder...

Christ they're tiny! 1/2" bore?? Is there a 5/8" in between size that might be able to give a bit more braking to the rear, I just can't see how a 1/2" single leading drum set up could even lock up!

www.topcatcustom.co.uk

Why would you want the rears to lock up?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

You wouldn't, I was meaning all brakes should have enough power to lock the wheels up, even though you should aim to brake as close to locking up as possible (without doing so) to get maximum stopping performance.

I just couldn't imagine that 1/2" cylinders (and single leading at that) would be able to give enough squeeze to actually do very much.

www.topcatcustom.co.uk

To save me typing, this about covers it.

http://www.minimania.com/article/942/BRAKE...bias_adjustment

and 1/2" cylinders will lock rear wheels, not that you want to.