ripvanwinkle
New Member
Hi
I'm still struggling with my brakes . I took a summer off Rovering to relieve the frustration and am now back into it !
I have rebuilt the brakes from the ground up . Rebuilt calipers , new pads , new master cylinder , new flex hoses , sevo rebuilt , new vacuum hoses etc etc .
After following the later Rover shop manual,swapping the front and rear brake connections from the slave cylinder and endless bleeding of front and rear cylinders at the same time I now have reliable , very heavy , non assisted braking ; at least from 20mph on a quiet suburban street .
I have started to trouble shoot the servo vacuum circuit using a vacuum gauge . The results are :
Gauge on the outlet connection from the servo to the master cylinder , lots of vacuum , which varies with the engine speed . The servo holds vacuum with the engine turned off , and the other side of the diaphragm vented to atmosphere
Conclusion : the non return valve works and there is no leakage across the diaphragm
Same results at the inlet to the " Big white valve on the master cylinder" BWV , : the line under the engine is clear
Connection to the outlet from the BWV lower vacuum , which does not vary with engine speed . ? Air leak inside the BWV ??
Same result at the return connection to the servo using a Tee in the line to connect the gauge .
Conclusion the return line under the engine is clear .
Vacuum falls as the brake pedal s depressed .
Conclusion the master cylinder is actuating the vent connection properly
Vacuum disappears from this side of the diaphragm as soon as the engine is stopped
I expected this side to hold vacuum until I pressed the brake pedal to vent air into the servo ??
Conclusion . Dunno ! Is there a problem inside the BWV which is part of a NEW Lucas master cylinder ,[ built by TRW in Japan , if the box is to be believed ]
Any advice on what to do next ; Winter is approaching !!
Cheers
RVW
I'm still struggling with my brakes . I took a summer off Rovering to relieve the frustration and am now back into it !
I have rebuilt the brakes from the ground up . Rebuilt calipers , new pads , new master cylinder , new flex hoses , sevo rebuilt , new vacuum hoses etc etc .
After following the later Rover shop manual,swapping the front and rear brake connections from the slave cylinder and endless bleeding of front and rear cylinders at the same time I now have reliable , very heavy , non assisted braking ; at least from 20mph on a quiet suburban street .
I have started to trouble shoot the servo vacuum circuit using a vacuum gauge . The results are :
Gauge on the outlet connection from the servo to the master cylinder , lots of vacuum , which varies with the engine speed . The servo holds vacuum with the engine turned off , and the other side of the diaphragm vented to atmosphere
Conclusion : the non return valve works and there is no leakage across the diaphragm
Same results at the inlet to the " Big white valve on the master cylinder" BWV , : the line under the engine is clear
Connection to the outlet from the BWV lower vacuum , which does not vary with engine speed . ? Air leak inside the BWV ??
Same result at the return connection to the servo using a Tee in the line to connect the gauge .
Conclusion the return line under the engine is clear .
Vacuum falls as the brake pedal s depressed .
Conclusion the master cylinder is actuating the vent connection properly
Vacuum disappears from this side of the diaphragm as soon as the engine is stopped
I expected this side to hold vacuum until I pressed the brake pedal to vent air into the servo ??
Conclusion . Dunno ! Is there a problem inside the BWV which is part of a NEW Lucas master cylinder ,[ built by TRW in Japan , if the box is to be believed ]
Any advice on what to do next ; Winter is approaching !!
Cheers
RVW