When you take it back to the shop have them check to make sure they didn't do this. This is the correct adjustment for your shoes.Īre your automatic brake adjusters working? A lot of times mechanics that aren't familiar with our brake systems just chuck them thinking that they are old technology that doesn't serve any purpose. When the car is up on the rack and you spin the tire the brake shoes should drag slightly without the brakes applied. I would check to see if you have any leaks in the brake lines where air may be getting in.ĭoes the pedal feel spongy? If not it could also be that they just didn't adjust the brake shoes correctly. If the car is running correctly than you more than likely have enough vacuum to the booster although you may want to replace the hose just in case it has a leak in it or some hairline cut that you can't readily see. How many hoses should I see connected to the power booster for vacuum? Can I check the hoses with the engine running to see if the hoses are directing vacuum to the power booster? Any other ideas for items to check before heading to the shop to spend some more $$$?įrom what I remember it's just one that comes from the intake manifold. Tommorrow, I want first check the lines/hoses going to the power booster. MC could also be bad but they usually don't go bad like that now.I think you stated that it was a generic MC so that being said it could be the MC itself but again, at least for me, I haven't seen many MC's go bad like that right out of the box! Now a new brake booster.? I've seen those go bad right out of the box. They should be able to test it and tell you. I would take the car back to whoever originally installed the MC and bled the brakes and let them know that either it wasn't bled thoroughly or the brake booster went bad. Sure enough that was it but I didn't watch him do it so I'm not sure if he took it out of the car or not. I mentioned it to a friend of mine and he suggested I take it up to his shop so he could bench bleed the MC. I had the same problem on my mustang and had spent 1/2 the day trying to bleed the brakes. Usually a pedal that goes to the floor means air in the system.Ī bad booster is usually a hard pedal. Certainly the brake booster may be bad but you stated that it was working prior so I can''t imagine a brake booster going bad just from changing the MC. Well.if the lines and the calipers have been bled thoroughly I can't think of anywhere else that there may be air other than the MC. Could the master cyclinder be defective or could a generic master cyclinder be the problem too ? Is there a way to check the master cyclinder for air other than taking the master cyclinder off? How is bench bleeding performed? Is this a project I can do at home or should I take my vehicle back to the service shop and have them repair it.
BLEEDING BRAKES ON 65 THUNDERBIRD MANUAL
Please advise of solutions in a detailed manner since I must follow your suggestions along with my Thunderbird shop manual open for diagrams to understand. I have had the system checked and there is no air in the lines.īefore I go off and purchase a new power brake booster what steps can I take to see if the master cyclinder is defective or if I have leaking hoses?
I have driven the 63' for 2 months and I continue to have this issue. My brake pedal went 3/4 of the way to the floorboard and stops prior to touching the floorboard. After the repair shop replaced the master cyclinder with a generic brand, replaced the brake shoes and bled the brake system I notice a difference immediately when I applied the brake pedal. I remembered my power brake booster was working properly and the brake pedal would require pressure to depress. When I took my 63' in for repairs I noticed I had issues with the master cyclinder. I felt nothing from the pedal and it made me think about a recent master cyclinder replacement completed on my Thunderbird and the difference in braking prior to the master cyclinder replacement. I depressed my brake pedal and turn on the engine.
After reading abaum's question regarding power brake issues, I went out to my 63' and followed the directions given to test the effectiveness of the power brake booster.
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