Thanks all.
Derek,
I thought that the cylinder size was dependent upon whether a servo was fitted rather than a PRV. That's certainly what the Brookhouse site suggests (
https://www.classicvolvoparts.co.uk/...d_Twin_Circuit). I think my non-servo car should have the 1" cylinder. If someone put on a 7/8 would that cause higher pressure at the rears and explain my rear brakes locking first?
I guess I'm going to have to bite the bullet and pull off the drums and check the cylinder size. Last time I pulled the drums on my 1800 I messed up pretty bad (
https://www.volvoforums.org.uk/showthread.php?t=304683). I'll pay more attention this time.
What is the "bore" that I measure to get the 7/8" or 1" size? Presumably the cylinder has to be removed before I can measure?
I've been also been looking into getting the front disks skimmed. I can only find one outfit nearby but they only offer skimming with the disks on the car service. Is this they way to go?
Phil