No. 1 system light illuminates after 30 minutes - Rolls-Royce and Bentley Forums
 
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post #1 of 10 (permalink) Old 07-29-2019, 09:48 AM Thread Starter
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No. 1 system light illuminates after 30 minutes

Good afternoon - my 81 Silver Spirit illuminates the No. 1 system light after about 30 minutes running - but after the car cools down, I have 22 pumps again on No. 1 system.

No. 2 system has a solid 30 pumps at all times and no problems.

The front spheres were renewed last year (and I have done about 500 miles since).

Any ideas welcome - thanks in advance - Colin Williams
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post #2 of 10 (permalink) Old 07-30-2019, 01:16 PM
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22 pumps is not so much, it starts to be low.


It could be the spheres, if they have 9 years or more, think replacing them
Could be air in the system, bleeding brake pressure switches could help.
Could be inside the brake pressure switches, stuck, dirty....


Various things to investigate.


Brake spheres are CRUCIAL. No more gas inside = NO MORE BRAKES


You will press the brake pedal, the car will just not react and will keep on driving....

97 Continental R
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post #3 of 10 (permalink) Old 07-30-2019, 06:50 PM
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How are you driving? [And by that I mean does this occur if you're going down a flat road or only when cornering?]


There were issues with these lights coming on when cornering, and there was a fix for same.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #4 of 10 (permalink) Old 07-31-2019, 06:05 AM
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Brian, I wonder if you are not thinking regarding the Low Fluid light which came on the first SZ and a kit was offered to have a delay ?
On late SZ, this issue was solved.

97 Continental R
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post #5 of 10 (permalink) Old 08-01-2019, 01:14 AM Thread Starter
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Thank you Jean7 - the spheres are only 1 year old - but I will get the system bled!
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post #6 of 10 (permalink) Old 08-01-2019, 01:15 AM Thread Starter
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Thank you - but i believe that is the low fluid light - mine definitely relates to low pressure.
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post #7 of 10 (permalink) Old 08-01-2019, 09:44 AM
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Have the system bled first, I insist on brake pressure switches
It it continue, open BPS and replace diaphragm and check for pin to be moving free.

https://www.flyingspares.com/shop/ro...h-gmf1026.html

Don't know where you are but if in EUrope I have several extra parts for those switches, washer, diaphragm, pin....
You could contact me via MP if required

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post #8 of 10 (permalink) Old 08-20-2019, 01:46 AM Thread Starter
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Thank you Jean7 - I am in Germany - not far from Frankfurt. The car is booked into a workshop this week for a service and (hopefully) repair of No. 1 system. I will let you know what happens next week.
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post #9 of 10 (permalink) Old 08-20-2019, 07:17 AM
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Great Satman


Ask they replace all LHM and bleed all callipers + brake pressure switches
Hope you went to a RR/ Bentley specialist


Tell them there are 2 callipers per wheel in the front = 4 bleeders


1 callipers in the rear BUT 2 bleeders per calliper = 4 bleerders


2 brake pressure switches = 2 bleeders


Total 10 bleeders to take care about

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post #10 of 10 (permalink) Old 08-29-2019, 01:41 AM Thread Starter
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So, as expected, the problem was a worn brake pump No. 1. New seal kit has solved the problem - thanks to all who replied.

I shall get No. 2 pump rebuilt in the near future.
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