Restoring a beaty 1973 Silver Shadow 1 - Rolls-Royce and Bentley Forums
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post #1 of 124 (permalink) Old 08-19-2019, 03:52 AM Thread Starter
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Question Restoring a beaty 1973 Silver Shadow 1

Hello im new to this forum website this is the best RR forum on line.
Yeah so just got this to restore it 1973 Silver Shadow Beautiful color about a month and a half ago too many stuff to write right now what work i did to it, so anyways did the master cylinder for the rear brakes got the original kit from England, and everything went good even clean out the reservoir which was clogged topped of with new DOT3 and Castor oil and all, bleed all the breaks like i was told, clean fluid was coming out.
pump the pedal for rear break the bottom bleeder not the top it went fine and bleed the other rest with the pedal to the floor with car running bleeding pressure is good.
Tested on the side street for like half hour works fine, but the problem i have with the breaks when i try to go on the freeway the rear breaks locked up and the break pedal went up and stiff but i was try to press the hard couple of times and it let go thank God, any one had this problem?
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File Type: jpg master-cylinder-breaks (3).jpg (313.7 KB, 26 views)
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File Type: jpg 20190807_171244.jpg (298.8 KB, 24 views)
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post #2 of 124 (permalink) Old 08-19-2019, 08:20 AM
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Most likely junk in the "G" valve or the master is not returning to rest all the way. Also, old brake (not break) hoses should be replaced. All the brake components are sensitive to even the smallest junk. Hoses break down internally and as a result the fluid becomes polluted with small rubber and often has a grey color.
Jack the rear under the differential , not the crossmember, and bleed the rear calipers. If it frees the wheels you know there is blockage.
Also the factory service manuals should be read. They explain how everything on the car is serviced.

LRL-41587C
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post #3 of 124 (permalink) Old 08-19-2019, 12:40 PM Thread Starter
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Master cylinder Adjustment

Sorry about that missed spelling the brakes it was late last night Wraithman and thanks for your help on this issue. Well the RR has 95,654 miles on it or so and i just got this car to work on, in the past some other mechanic was working on it he did some stuff that i don't like that he did on it, so im right trying to correct the problems which it sucks for me but any ways the rear high control doesn't work at all from the previous mechanic. had the master cyl rebuild and it was giving good pressure but one think that i missed i guess i didn't adjust the operation rod on the master cyl, i finally found the right web site for it and the prints are clear, im going to adjust the rod to the specific spec as on the picture. then jack up the rear end bleed and see if they lock up again. One more thing will the rear levering system not working will cause the master brake sys to lock up??? I think it has nothing to do with the master brakes
(not sure what is the "G" valve or location, i have the pic of the whole sys)
thank you for your help

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post #4 of 124 (permalink) Old 08-19-2019, 01:41 PM Thread Starter
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Master cylinder locked up

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Originally Posted by danielrolls View Post
hello im new to this forum website this is the best rr forum on line.
yeah so just got this to restore it 1973 silver shadow beautiful color about a month and a half ago too many stuff to write right now what work i did to it, so anyways did the master cylinder for the rear brakes got the original kit from england, and everything went good even clean out the reservoir which was clogged topped of with new dot3 and castor oil and all, bleed all the breaks like i was told, clean fluid was coming out.
Pump the pedal for rear brakes the bottom bleeder not the top it went fine and bleed the other rest with the pedal to the floor with car running bleeding pressure is good.
Tested on the side street for like half hour works fine, but the problem i have with the breaks when i try to go on the freeway the rear brakes locked up and the break pedal went up and stiff but i was try to press the hard couple of times and it let go thank god, any one had this problem?

sorry about the spelling
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post #5 of 124 (permalink) Old 08-19-2019, 02:54 PM
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Hi Dan, Your situation is very common, ie previous mechanic trying to work on a Rolls and has no clue. You are on the right path coming here for accurate advicea and direction. The G valve controls rear wheel lock-up during sudden braking and is known to hang up with debris because it is in the rear brake circuit. The height control system is part of circuit #2 and is mostly passive unless passengers or a load is in the trunk and triggered into fast mode via the height control solenoid valve letting in hi pressure to compensate for the weight.
Completely separate from both brake circuit but shares the pressure and rear reservoir.

LRL-41587C
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post #6 of 124 (permalink) Old 08-19-2019, 03:13 PM Thread Starter
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Ok so this seems right that is the G-valve ill try to find it and rebuild it. here are some pictures of it not sure the right location but i can match it wit the pictures or trace the brake lines on the return to the system.

thank you sir
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File Type: gif Brakepressure tekst.gif (8.1 KB, 8 views)
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post #7 of 124 (permalink) Old 08-19-2019, 03:25 PM Thread Starter
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ok so this seems right that is the g-valve ill try to find it and rebuild it. Here are some pictures of it not sure the right location but i can match it wit the pictures or trace the brake lines on the return to the system.

Thank you sir

(but i should still adjust the master cylinder rod?)
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post #8 of 124 (permalink) Old 08-19-2019, 04:43 PM
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G valve is on the rat trap directly above the master cylinder. Yes you should adjust the master pushrod to have some free play. While you're in there, make sure both of the distribution valves have clearance too and that one is not hanging up. That could be the cause of rear brakes staying on as could collapsed rear flex hoses. They collapse inside and act as one way valves.

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post #9 of 124 (permalink) Old 08-19-2019, 04:46 PM
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I wouldn't bother with the G valve until you have free play on the master pushrod and have checked rear hoses. Both are more likely to be the issue rather than the G valve.

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post #10 of 124 (permalink) Old 08-26-2019, 02:53 PM Thread Starter
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Upate BRAKES

Just an update of this brake situation that im having, so i had some time to check out the problem which i adjusted the master cylinder rod it was in,,, about a quarter of an inch, then i tried to bleed the master brakes to find out that the passenger side break caliper is leaking now, and thats why i have a partial break failed light on, need to rebuild it and get new break pads y any good web site for parts for the Silver Shadow? (And yes all the flex brake lines been change)
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