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Message |
    
William H. Trovinger II
Prolific User
Username: bill_trovinger
Post Number: 78
Registered: 8-2003
| | Posted on Friday, 27 February, 2004 - 02:34 pm: |    |
Hello All;
As spring is just around the corner (here in America’s Heartland) it is time to tackle a few problems on my ’76 Shadow. I am hoping that one of our experts has a suggestion on my brake problem.
After rebuilding the rams and height control valves and bleeding the system last fall a problem developed. Any time the car is started (does not matter how long turned off few minutes or over night) the “Parking Brake” light comes on and then stays on for about 1 to 2 minutes if idling and about 1 block if you start driving right away. All hydraulics seems to be working properly and brakes are OK. Rams are pushing the rear a little higher than I would like and I will have to adjust that this weekend also. Both pressure-warning lights go out right as engine starts and parking brake is not stuck.
Any suggestions Please!
Regards,
Bill
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Bill Coburn
Grand Master
Username: bill_coburn
Post Number: 115
Registered: 4-2003
| | Posted on Friday, 27 February, 2004 - 05:04 pm: | |
Bill do you have a foot operated emergency brake or a hand operated hand brake? |
Graeme Söderlund
Frequent User
Username: graemeaus
Post Number: 29
Registered: 6-2003
| | Posted on Friday, 27 February, 2004 - 05:32 pm: | |
I was interested to read Bill's comments re the "Parking Brake"light.
I thought I had sticking brakes as the light showed on and stayed!
I jacked the car up to check the brakes and all seemed well but still the light stayed on - so decided to dismantle the unit and check out the switch at the end of the parking brake system.
It was corroded and after a good clean with wet/dry paper, all began functioning correctly again.Treated the whole lot to a good spray with WD40 at the same time to ensure corrosion stays away. |
David Gore
Moderator
Username: david_gore
Post Number: 207
Registered: 4-2003
| | Posted on Friday, 27 February, 2004 - 08:52 pm: | |
Just another thought; on Corniches at least the handbrake warning light also functions as a warning light for rear brake light bulb failure; the light will come on when the brake pedal is depressed and one or more brakelights are not working. I suspect this warning circuit would involve the dreaded Lucas relay and if this relay is faulty, it may be responsible for the light remaining on after the handbrake is released. |
William H. Trovinger II
Prolific User
Username: bill_trovinger
Post Number: 79
Registered: 8-2003
| | Posted on Saturday, 28 February, 2004 - 04:29 am: | |
Bill; Graeme and David;
Thank you all for your responses. I do not think any of these could be the cause as the parking brake (pedal type) is working fine and the light goes no and off properly with the application and release of the parking brake. Further, the light only comes on during that short period after starting the engine.
I talked with Greg Albers though he has never run across this problem, he feels it is acting like one of the pressure warning lights. His recommendation is to trace back the three circuits (parking light and both pressure lights) to see if I have a loose wire toughing somewhere. One idea he had is a printed circuit board under the dash for the (?) warning systems.
I agree with him that the light is acting like a pressure warning light but wonder if a loose wire could be the cause as the problem is constant. I would think that vibrations would cause the wire to sometimes touch and other times not.
In conclusion I guess I will be doing some wire tracing this weekend and will keep you posted when and if I find the culprit.
Best regards,
Bill
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William H. Trovinger II
Prolific User
Username: bill_trovinger
Post Number: 85
Registered: 8-2003
| | Posted on Friday, 02 April, 2004 - 03:51 am: | |
Hello All;
We had another round of cold weather that delayed further investigation on this problem. However, now I have gotten back out to the garage and double-checked this light problem. I was mistaken, the Parking Brake Warning Light is working as if it is the B Hydraulic Pressure Warning Light and the B Pressure Warning Light is working as if it is the Parking Brake Warning Light. If I put the parking brake on or install a bad stop lamp the B Hydraulic light comes on. And if I pump down the hydraulic system the Parking Brake and A Hydraulic system lights come on. I have (memory going in middle age must be the Glenlevit) always assumed that these to lights where functioning properly but the more I think about the situation the less certain I am of this. So, I plan to proceed on the assumption that the problem has been there for a while and had nothing to do with the rebuilding of the rams and height control valves.
My guess is that I have a short of some kind causing these two warning systems to cross. Does this sound logical to the experts of this site? If so does anyone have a suggestion of where to start my hunt? Looking at the wiring diagrams this those seems unlikely so…
The only other thing I can possible think of is based on the following: If the glass with the labeling for all the warning lights is one unit and the actual lamps bulbs for each warning devise just plug in the back then it could be possible that the two lamps where put into the wrong positions back when the car got a complete new interior in 1999 and neither I nor any mechanic never noticed the problem. I looked at the parts manual but can not tell, it does appear that this would be possible on a SS II but on a SS I?
Would appreciate your thoughts on this matter!
Regards,
Bill
SRE23726
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William H. Trovinger II
Prolific User
Username: bill_trovinger
Post Number: 88
Registered: 8-2003
| | Posted on Saturday, 03 April, 2004 - 07:45 am: | |
Never Mind....
In follow-up to my own question the place to start was the warning lights. Seems that when the interior was redone in ’99 these two sockets where switched around. I feel mad at myself  for never picking up on the problem till now. However, I also must state that after ’99 the car has been to two RR Specialists (one a dealer) for hydraulic work and neither mentioned let alone rectified the problem. I was able to confirm this was the problem by removing the wood fascia and comparing wire colors with diagram.
Best regards,
Bill
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