12 replies to this topic

[craig 1010cc]

finally, we've moved onto pootles brakes

Quick overview of the brakes

minsport ally 4 pots (set up for 7.5" brakes), 1 bleed nipple per wheel (nipple at the top)
refitted tandum master cylinder and pressure valve thingy (all working fine when poote was taken off of the road)
stock rear brakes (but with superfins fitted)

We have got clean fluid out of all the nipples , good brakes at the rear but no peadle pressure or front brakes. The pistons are moving out and if you pump the peadle quickly you get some pressure, but as soon as you let off and re apply there is nothing.
We have cracked of the joints at the pressure valve jobby and there is fluid moving comining out of all ok.


Any ideas?

[Big_Adam]

Did you put them on the right way up (common problem).

[Jordie]

(nipple at the top)

[craig 1010cc]

Did you put them on the right way up (common problem).

1st thing we checked. Nipple at the top.

[Peteucg]

i had the same problem and it was the servo(it is from a metro).....
fluid was coming out of the nipples but,there was air in the servo...
i don't know if there is any difference with your servo,if you have one...

[craig 1010cc]

No servo on mine

[Jordie]

All the hose joints and pipe unions tight?

[craig 1010cc]

All the hose joints and pipe unions tight?

I'll double check, but none where seeping any fluid

[blacktulip]

if u press the pedal slowly... does the pressure drop as the pedal pressed. i think this indicated the master cylinder letting by.

[craig 1010cc]

if u press the pedal slowly... does the pressure drop as the pedal pressed. i think this indicated the master cylinder letting by.

pressing the pedal slowly and I get no pedal pressure, only if it is pumped quickly do I get any

Going to get an easy bleed on it tomorrow and see whats what

[craig 1010cc]

Solved it (we think)

It seems I had plumed the master cylinder in back to front (don't know how as I reused the pipes). Still got a bit of a long brake pedal (don't know if thats normal for a non servo'd set-up with 4 pots) but they seem to bite fine.

The test will be when we take him out for the first road test

[Ethel]

I don't think it makes much difference which circuit is top or bottom - the bores are the same size unless you have the stepped master cylinder and doesn't that have different sized pipe unions?

4 pots have slightly more overall area than the standard mini setup (80.97 sq cm to 80.754 sq cm) so fractionally more pedal travel should result.

As the min has a vertical master cylinder some air can get trapped at the top, suspect swapping pipes may have let it escape. Pays to loosen pipe joints and bleed through them too sometimes.

If you find your pedal is too long there is a smaller bore rear cylinder available it was fitted without a pressure regulator.

[Bass Man]

The test will be when we take him out for the first road test

I suggest very early morning then.....

We have non-servo brakes and the pedal travel is quite small, about 25mm, moving a bit more most time my daughter uses it though...