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post #1 of 23 (permalink) Old 06-11-2019, 06:45 PM Thread Starter
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Advice need please

Hi all just bought my first Bentley T1 1968 with 6.2 engine.
Currently every time I brake the left hand red brake warning light comes on, on the dash.
Also lost my main beam tonight, the dip is on the floor and no longer clicks so presume its a relay fault, the lights light up when I use the flash but I can't get them to stay on main beam, if the problem is a relay where would I find this?
It's going to be a steep learning curve I think.
PS Title should read advice needed please
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post #2 of 23 (permalink) Old 06-11-2019, 07:45 PM
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Do not drive the car until you have fixed the brakes!! If a warning light illuminates it means you have dangerously low pressure in one of the two brake systems. Depending on whether the other light functions or not you may be a couple pumps of the brakes away from no braking at all. There is a brake warning light test button on the dash. When you push this do both brake warning lights illuminate? This is to test the bulbs. You need to study how the Rolls-Royce brake system works. They do not have a conventional system. There are two pumps mounted in the Vee of the engine that run off the engine camshaft. These build up pressure into two brake accumulator spheres through accumulator valves. The accumulator spheres have a diaphragm inside, one side is charged with 1000 psi of nitrogen, and brake fluid is pumped against this up to 2500 psi and regulated by the accumulator valve. The 1000 psi of nitrogen acting against the brake fluid is what gives you a pressure reserve for multiple pumps of the brake pedal. If all the nitrogen has leaked out of both spheres you will only have one application of the brakes before they fail if the engine stalls or no brakes at all if the engine is not running. The brake pedal is attached to distribution valves that direct the pressure created in the spheres out to the brake calipers on both systems. The #2 system also supplies pressure to the rear height control valves to keep the rear of the car at the correct ride height when weight is added to the trunk. To test the brake sphere pressure, run the engine for five minutes. Make sure you are on level ground and the wheels are chocked, do not rely solely on the parking brake. Slowly pump the brake pedal and count the pumps until system #1 warning light illuminates, then continue pumping and counting until #2 illuminates. In a fully charged system, you would get 60 to 80 pumps or more before the lights come on. Less than 20 pumps means the brake spheres need attention very soon. Anything less that 10 and you should not drive the car.
There are a couple of good resources to learn about your car, heritage.bentleymotors.com is where you can find the factory workshop manual for your model, the owner's handbook is here: http://rrtechnical.info/sy/handbooks/1975e.pdf in case you did not receive one with the car, and http://rrtechnical.info/TeeOne/teeone.htm. Tee-One Topics have several DIY articles that you will find help greatly with repairs you intend on doing yourself. Search the index for articles which are referenced by "SY". That is the shorthand designation for Silver Shadows and Bentley T1's. Welcome to the forum!

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post #3 of 23 (permalink) Old 06-11-2019, 07:53 PM
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If the dip switch button on the floor is not clicking it is faulty, it is not a relay issue. Sometimes the carpet will jam up underneath it and prevent operation.

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post #4 of 23 (permalink) Old 06-11-2019, 07:53 PM
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There are headlamp fuses and are indicated on the fuse panel and pull down chart within the panel.
However you won't be going anywhere until your brakes are sorted out. The indicator lamp when on to alert you to a critical condition regarding the brakes, specifically low pressure or low fluid level. Do you know which? Is the fluid within the square reservoir at the required level?
If it's at the required level you have lo pressure in system 1 or 2. Do you have a RR/Bentley specialist that you can bring the car to?

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post #5 of 23 (permalink) Old 06-11-2019, 08:30 PM
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I forgot to insert "Shut the engine off and turn the ignition back on but do not start the engine" after running the engine for 5 minutes for the brake sphere reserve nitrogen test.

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post #6 of 23 (permalink) Old 06-12-2019, 02:47 AM
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Better advice - remove entire brake system and put a GM booster and a master cylinder in your car - run some hydraulic lines to each caliper and make your life easier.

You will spend the rest of your life trying to get these brakes to work correctly if you don't.
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post #7 of 23 (permalink) Old 06-12-2019, 03:31 AM Thread Starter
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Originally Posted by Wraithman View Post
There are headlamp fuses and are indicated on the fuse panel and pull down chart within the panel.
However you won't be going anywhere until your brakes are sorted out. The indicator lamp when on to alert you to a critical condition regarding the brakes, specifically low pressure or low fluid level. Do you know which? Is the fluid within the square reservoir at the required level?
If it's at the required level you have lo pressure in system 1 or 2. Do you have a RR/Bentley specialist that you can bring the car to?
Yes there is fluid in the reservoir so must be low pressure. I'm not aware of any specialist close to me. Have to do some research, many thanks
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post #8 of 23 (permalink) Old 06-12-2019, 03:32 AM Thread Starter
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If the dip switch button on the floor is not clicking it is faulty, it is not a relay issue. Sometimes the carpet will jam up underneath it and prevent operation.
Many thanks Jim for all your advice on both subjects. Given me a lot to go on.
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post #9 of 23 (permalink) Old 06-12-2019, 03:57 AM
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You're welcome. You can certainly ignore that "better advice" from blackenedrolls. Where are you located?

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post #10 of 23 (permalink) Old 06-12-2019, 09:40 AM Thread Starter
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You're welcome. You can certainly ignore that "better advice" from blackenedrolls. Where are you located?
Isle of Wight UK
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