| Author | Message | ||
     michael vass Prolific User Username: mikebentleyturbo2 Post Number: 159 Registered: 7-2015 |
Hi All Removed the rear pads on my car today , just for a check and clean up, found the back of the pads seeming to show the bottom pistons (inner and outer) working harder than the top 2? is this normal or is there an imbalance or other fault? See attached picture. Thanks in advance  Ps I have looked at the diagram and even more confused there seems a joint between both systems but only 1 goes through the G valve? (I've circled the joint. So this means the rear brakes work off 1 system only? not dual syatem? Thanks Mike  | ||
| David Gore Moderator Username: david_gore Post Number: 2034 Registered: 4-2003 |
Michael, On DRH14434, the "G" valve was mounted at the back of the low pressure master cylinder and only functioned on the low pressure circuit. When the master cylinder was deleted on later cars, I would have expected R-R to adopt a dual circuit system in common with other vehicles. If your diagram is correct, it appears the rear brakes are on a single circuit which splits into 2 with the "G" valve protecting one circuit and not the other. I may be reading the diagram incorrectly and will defer to anyone with more knowledge than I. P.S. Have deleted the duplicate thread as requested. | ||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 994 Registered: 9-2004 |
Maybe just a simple brake hose failing! | ||
| michael vass Prolific User Username: mikebentleyturbo2 Post Number: 162 Registered: 7-2015 |
Thanks both, I don't understand how you can get equal pressure to all the pistons if you restrict the pressure to some and not others? .or I am reading it wrong ? Thanks Mike | ||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 995 Registered: 9-2004 |
Drag trailing and leading part of the pad with doggy hose. Maybe confirmed by position and side of fitment of pad. LHM can still cause sticking caliper pistons if not changed after time. Also hose failings, Citroen avoided hoses in most LHM etc use. | ||
| Paul Yorke Grand Master Username: paul_yorke Post Number: 1521 Registered: 6-2006 |
Are the pads tapered and thinner at the 'extra pressure' end? 99% of the time the g valve will not affect braking. It only comes into play braking down steeper hills and in emergency stops. | ||
| michael vass Prolific User Username: mikebentleyturbo2 Post Number: 163 Registered: 7-2015 |
Hi Paul At the moment they are not tapered, forgot to mention this is a new caliper. Why do I need a G valve with ABS? Thanks Mike | ||
| gordon le feuvre Prolific User Username: triumph Post Number: 112 Registered: 7-2012 |
The manual states that "g" valve in in second circuit "to maintain optimum braking" even as stated car has abs? Does seem to be overkill as the whole point of a "g" valve is to prevent locking/skidding of rear wheels and so does abs!Never seen tapered pads on Spirit, look for anything obvious like sticking piston, air in system, reduced pressure on that circuit? | ||
| michael vass Prolific User Username: mikebentleyturbo2 Post Number: 167 Registered: 7-2015 |
Hi Gordon It's a nearly new caliper, I've bled the system , there will be reduced pressure because of that G valve but it seems by design that way. I'd love to know how that valve maintains optimum braking with ABS? only working on 4 of 8 pistons ,surely if it were that good it should work on all 8? Thanks Mike |
