| Author | Message | ||
     Richard Greene Frequent User Username: benzjag Post Number: 221 Registered: 12-2012 |
Would anyone know how much vacuum a 1980 Shadow's engine should produce? Thanks! Richard | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1469 Registered: 11-2015 |
Richard, I'm surish my 1970 vacuum readings would be identical to yours. I'll try and get a gauge on my car later. I forget what it read, but I would think 20 in or do at idle. Maybe 21. | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1480 Registered: 11-2015 |
I just measured the vacuum with a warm engine https://www.youtube.com/watch?v=WvjqVXT-9XI | ||
| Richard Greene Frequent User Username: benzjag Post Number: 222 Registered: 12-2012 |
Ross, A HUGE thank you for your time to check the vacuum! Really appreciate the video! I just bought a 80 Wraith with severe brake problems! The owner almost gifted me the car. My mechanic wants to use it to convert the system to standard brakes. If anyone can, he will. I will update in a separate thread the progress. His only concern was the vacuum;therefore, my question. Thanks again! Richard  | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1482 Registered: 11-2015 |
Richard, First, that car is gorgeous and getting it for a song means I ofically hate you. Sorry. Second, Before you get on to converting the brakes, I would suspect that you are not that far out on getting the actual brakes working. Looking at that car, it is not as bad as you think. Third, While you have enough vacuum to run a vacuum booster, IF you went the replacing the brakes route, you really should use a GM hydroboost system rather than a vacuum diaphragm system. The pressure will be much closer to the original. The car probably has a saginaw pump which means all standard GM fittings. | ||
| Omar M. Shams Grand Master Username: omar Post Number: 2082 Registered: 04-2009 |
I have seen Shadows converted to booster systems and every time this has resulted in disaster. Fix the original system or scrap the car. There is no alternative. Thanks Omar | ||
| Geoff Wootton Grand Master Username: dounraey Post Number: 2225 Registered: 05-2012 |
I agree with Omar and can't help thinking how much easier it would be to simply repair the existing system. | ||
| Omar M. Shams Grand Master Username: omar Post Number: 2083 Registered: 04-2009 |
You are totally right Geoff. The system is much easier to repair than to replace. Even if every single component is overhauled. | ||
| David Gore Moderator Username: david_gore Post Number: 3787 Registered: 04-2003 |
Having done a complete Shadow hydraulic system overhaul, it is not as difficult as you might think provided you use the Workshop manual TSD4200 available for free download from the Technical Library and the resources of this forum when in doubt: http://rrtechnical.info/SY/TSD4200/tsd4200.html | ||
| Larry Kavanagh Frequent User Username: shadow_11 Post Number: 666 Registered: 05-2016 |
I would also recommend servicing the existing hydraulic brake system, it's the easiest option and avoids devaluing the car. | ||
| Kelly Opfar Frequent User Username: kelly_opfar Post Number: 256 Registered: 07-2004 |
Richard, I'm in the USA and I can help you get your brake components in working order. Email me: Kelly@BritishToolWorks.com http://BritishToolWorks.com | ||
| ross kowalski Prolific User Username: cdfpw Post Number: 1484 Registered: 11-2015 |
Richard, What is the braking system currently doing? Is it intact and complete? If the underside of that car is as clean at the top I bet it would be a honey to work on. |
