Series 3 At wits end with brakes

Hello,

I need some serious help please.
Just changed the following:

• Brake Master Cylinder;
• All 4 wheel cylinders;
• Hard pipes for new Kunifer pipes;
• All unions;
• All hoses.

Now the brakes are locked-on on all 4 wheels and the brake pedal is solid.

I have bled it out 4 times as per the book - no air coming thru the last time around.

Its a series 3 with a non-servo single pipe system with a CV type master cylinder.

Can anyone diagnose this problem?

Master cylinder push rod adjustment?

Agreed, most likely culpret.

Flossie said:

Master cylinder push rod adjustment?

Click to expand...

I did wonder.

The pushrod lock nut is right at the end of the pushrod ie set for maximum brake pedal return.

Have I got it wrong and the nut should be further up the pushrod to properly pull back on the piston?

Can't remember tbh.
You just need some movement of the pedal without the push rod moving at all.

Flossie said:

Can't remember tbh.
You just need some movement of the pedal without the push rod moving at all.

Click to expand...

Flossie and Rob1miles - thanks for your help, slacked off and adjusted the pushrod (as per Haynes manual) and now brakes are spot on.
That is the good thing about this forum - lots of experience and mostly better than my own.

The master rod does not pull the piston back,it has a spring that pushes it back, but if rod is not adjusted correctly piston can not come far enough back to allow fluid to return to reservoir and the brakes stay on.

I see it is now sorted.

Georgeblade said:

Flossie and Rob1miles - thanks for your help, slacked off and adjusted the pushrod (as per Haynes manual) and now brakes are spot on.
That is the good thing about this forum - lots of experience and mostly better than my own.

Click to expand...

If you put an @ before the name then that member will get an alert.
Like this @Georgeblade

Thanks for the info @Flossy.

tottot said:

Thanks for the info @Flossy.

Click to expand...

Nooo....
Flossie!
@tottot