Bendix Treadle Vac
Posted by JeromeSolberg On 2017/5/7 20:16:33
I had a bad experience with my BTV when i had it at a garage getting it back running after it had sat for 10 years, it appeared to completely suck all the fluid out of the mastr cylinder. So I was worried about it, knowing it had sat for 10+ years, it's problems with cruddy fluid (and having a bad experience with this particular master cylinder), and also knowing the cost to rebuild one ($400), I made an experiment where I retrofitted a 1971-1975 Ford Courier master cylinder (dual master, 3/4" bore),
14976-05229974http://www.partsgeek.com/gbproducts/MC/14976-07115799.html?utm_content=MC&utm_term=1972-1975+Ford+Courier+Brake+Master+Cylinder+A1+Cardone+13-1777+72-75+Ford+Brake+Master+Cylinder+1973+1974&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=Cj0KEQjwi7vIBRDpo9W8y7Ct6ZcBEiQA1CwV2H3IoXcgyord1BxPKQrkEdOAi3Y4G9Lg4wJXIOnXFqcaAmWj8P8HAQ&ad=47362750812
This was the smallest-bore master cylinder I could find. The mathematics say that to match the 0.652" single-cylinder BTV, I should get something like a 1/2" bore dual-master, but I could not find anything like that.
I coupled this to a 1981 Ford Courier power booster (7" nominal diameter). Turns out it plugs right in:
Part # 53-5211http://www.oreillyauto.com/site/c/detail/OBH3/535211/01305.oap?year=1981&make=Ford&model=Courier&vi=1107740&ck=Search_01305_1107740_-1&pt=01305&ppt=C0066#itemDetailTab_
I was able to make this fit, and with the help of a few adapters from metric to English, and some tees, I was able to get everything attached. To get the thing attached to the brake pedal I bought a 10mm fine-thread rod end from FK Rod Ends. Not many people make 10mm find-thread rod ends, and in the U.S. I think they are only available from FK. to make it fit I had to grind it down to make it narrow enough to fit into the brake pedal.http://www.fkrodends.com/http://www.fkrodends.com/CMMCFM7.html
Everything fit together. I fabricated a bracket and was able to remotely mount the reservoir.
It actually looked really good and was easier to get to and service in comparison to the BTV. I attach a bunch of pictures.
But - even with the larger booster, it just didn't give you enough brake power. I could deal with it, but I had other people drive it and they thought it was just too hard to push on the pedal. I ended up rebuilding the BTV using the kit from Kanters, and I am much happier with the braking now.
But it is still darn-near impossible to check the brake fluid level, the best I can do, really, is to stick my finger in it from either way on top or underneath, and see if the level is at where I think it should be on my finger.
Has anyone, at the very least, retrofitted something to put a remove reservoir. I know the current cap is vented, but maybe if I replaced it with a pipe fitting? Does that fit?
I really like to be able to check everything when going on a trip, or in the middle of it. It gives one peace of mind.
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14976-05229974http://www.partsgeek.com/gbproducts/MC/14976-07115799.html?utm_content=MC&utm_term=1972-1975+Ford+Courier+Brake+Master+Cylinder+A1+Cardone+13-1777+72-75+Ford+Brake+Master+Cylinder+1973+1974&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=Cj0KEQjwi7vIBRDpo9W8y7Ct6ZcBEiQA1CwV2H3IoXcgyord1BxPKQrkEdOAi3Y4G9Lg4wJXIOnXFqcaAmWj8P8HAQ&ad=47362750812
This was the smallest-bore master cylinder I could find. The mathematics say that to match the 0.652" single-cylinder BTV, I should get something like a 1/2" bore dual-master, but I could not find anything like that.
I coupled this to a 1981 Ford Courier power booster (7" nominal diameter). Turns out it plugs right in:
Part # 53-5211http://www.oreillyauto.com/site/c/detail/OBH3/535211/01305.oap?year=1981&make=Ford&model=Courier&vi=1107740&ck=Search_01305_1107740_-1&pt=01305&ppt=C0066#itemDetailTab_
I was able to make this fit, and with the help of a few adapters from metric to English, and some tees, I was able to get everything attached. To get the thing attached to the brake pedal I bought a 10mm fine-thread rod end from FK Rod Ends. Not many people make 10mm find-thread rod ends, and in the U.S. I think they are only available from FK. to make it fit I had to grind it down to make it narrow enough to fit into the brake pedal.http://www.fkrodends.com/http://www.fkrodends.com/CMMCFM7.html
Everything fit together. I fabricated a bracket and was able to remotely mount the reservoir.
It actually looked really good and was easier to get to and service in comparison to the BTV. I attach a bunch of pictures.
But - even with the larger booster, it just didn't give you enough brake power. I could deal with it, but I had other people drive it and they thought it was just too hard to push on the pedal. I ended up rebuilding the BTV using the kit from Kanters, and I am much happier with the braking now.
But it is still darn-near impossible to check the brake fluid level, the best I can do, really, is to stick my finger in it from either way on top or underneath, and see if the level is at where I think it should be on my finger.
Has anyone, at the very least, retrofitted something to put a remove reservoir. I know the current cap is vented, but maybe if I replaced it with a pipe fitting? Does that fit?
I really like to be able to check everything when going on a trip, or in the middle of it. It gives one peace of mind.
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