5 replies to this topic

[cjreyn]

Hi,

I'm replacing the front discs, calipers and hoses (from the subframe mount to the caliper) on my 1989 Mini Thirty. As I understand it, the braking system is split into two circuits: front and back. Since I don't intend replacing the rear drums (they were replaced recently) I was hoping to be able to completely drain the front circuit without affecting the rears. Is this possible?

 

If I can drain the fronts, what order should I bleed them in... the side closest to the master cylinder first, or the side farthest away?

 

Cheers

 

Chris

[GraemeC]

You will need to bleed both circuits - they are not entirely independent (otherwise there would need to be too reservoirs)

[cal844]

You'll need to bleed both circuits to be safe.

Start with the longest run first (so on a RHD car the order is

passenger rear
Drivers rear
Passenger front
Drivers front

I use the pipe in a jar 2 man method.

[Ethel]

It's probably doable, there's a divider in the reservoir so that if one circuit leaks out all its fluid the other still has some to play with.

 

I'd still agree it's best to take the opportunity to refresh the entire system. The  limiter valve on later cars can make things tricky as the front circuit shuts off the rear - start with the rear (as stated) for that reason. If it turns in to fun & games "limiter lockout" could still be the issue, briefly cracking a front bleed screw open to release any pressure could help.

 

When prattling on about bleeding I've like to mention I prefer using a syringe on the nips to pull the fluid through. 

[Midas Mk1]

Good diagrams and explanations on the different systems in the haynes manual. For what it’s worth and effort i’d still bleed the rear.

[timmy850]

It is suggested to flush through the fluid every couple of years, so even just letting the rear gravity bleed till you get new fluid is a good idea