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EFV-8 Club Forum / General Ford Discussion / leaking 2nd new wheel cylinder

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Posted By Discussion Topic: leaking 2nd new wheel cylinder -- page: 1 2     37 Coupe 08-29-2010 @ 1:40 PM reply profile send p.m. Member Posts: 362 Joined: Oct 2009 My results from using Dot 5 synthetic over last 25 years : Way more positive than negative. supereal 08-29-2010 @ 10:13 AM reply profile send p.m. Senior Posts: 6819 Joined: Oct 2009 The shoe with the longer lining ("primary shoe") faces toward the front, and is activated by the larger diameter side of the wheel cylinder. The shorter shoe is called the "secondary" shoe, and faces toward the rear. Anyone who doesn't agree with this should consult a reliable shop manual. 37RAGTOPMAN 08-28-2010 @ 4:50 PM reply profile send p.m. Senior Posts: 1959 Joined: Oct 2009 TOM O What ever works for you, to much money and to many problems.for me to even think about using,DOT 5 SILICONE BRAKE FLUID. the wheel cylinders froze tight on the 1962 MERCEDES BENZ DIESEL,had everything new, 6 wheel cylinders,[ 4 IN FRONT ] and all new hoses and new master cylinder, this is the way it worked, one day you have a fantastic pedal, then the next day you drive down to the end of block and hit the brakes and the pedal goes to the floor, scared the xxxx out of me, took the car home. rebleed the brakes with regualr brake fluid,had no probems for years.and then sold the car, on the 48 CHEVY STATIONWAGON,was a customers car, all new wheel cylinders, all new metal lines new rubber hoses,and new master cylinder,.nothing else to replace, about a year later. went to bleed the brakes because the pedal was soft,and the brake pedal stuck to the floor, master cylinder piston stuck down at the bottom,had to rebuild with new parts and rebleed the brakes and got a great pedal and problem solved with regular brake fluid, so you can see why I have no interest in using, this fluid was made for aircraft,and later motorcycles started using,and I am thinking for race cars, I do use and like the syntheic brake fluid,sold by VALVOLINE, about $5.00 a quart and mixes with regular fluid and is rated DOT 4, just my 3 cents worth. SILCONE BRAKE FLUID ,,ALSO IT ATE UP THE NEW STOP LIGHTSWITCHS, if you use a hydraulic sopt light switch. people blowing thier horns because of no stop lights, was not a pleasant experience.FOR SURE. 37RAGTOPMAN an KEEP ON TRUCKIN,, This message was edited by 37RAGTOPMAN on 8-30-10 @ 4:50 PM fredster 08-28-2010 @ 4:24 PM reply profile send p.m. Member Posts: 6 Joined: Aug 2010 Thanks for the reply. A buddy of mine helped me and said my brake shoes was installed backwards.the shoe with more lining should be in the back he said.The right is installed wrong as well but why did it not leaked?so whats going on here? I noticed that when i put the brakeshoes on top of each other the lenght of the part that pushes the piston is longer than the other brake shoe.the brake shoe with more lining has a longer tip that pushes the piston , but the wheel cylinder's large bore side also has a longer bore so it make sense to have the shoe with more lining to be on this side.So did i really have the shoe on backwards but since it's not leaking anymore, I shouldn't complain right.I did not switch the right side shoes cos i'm not convinced the shoes are on backwards. So please shed some light on this dilema......thanks b29fred deluxe40 08-28-2010 @ 9:04 AM reply profile send p.m. Member Posts: 413 Joined: Oct 2009 I have two old Fords with Dot 5 fluid. I went through a couple of copper washers getting it to stop leaking when I rebuilt the brakes, but both cars have now been in service for more than 12 years without problems. They go out at least once each month for a 20 mile drive. TomO 08-28-2010 @ 7:23 AM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 Dot 5 is not used by the factory in any modern cars that I know of. It cannot be used in ABS systems as the ABS action will entrain air into the fluid. Most of the modern cars use a closed system with the rubber bladder to reduce the amount of moisture in the brake fluid. Our older cars have a vented system that allows air to replace the fluid as the brake shoes wear and to compensate for temperature changes of the fluid. I don't know what problems you had with Dot 5, but I am not alone in being satisfied with it. There are many others that have had it in their cars for years without it causing any problems. Tom 37RAGTOPMAN 08-28-2010 @ 6:03 AM reply profile send p.m. Senior Posts: 1959 Joined: Oct 2009 I think the cast iron master cylinder also causes water to enter the system by sweating, also there is a vent on the master cylinder , this is were air enters, also entering is water that is in the air. usually the dot 5 systems in motorcycles AND IN MODERN CARS have a rubber bladder that does not let outside air in, and also no water, the bladder compensates for the wear in the brake pads,letting the fluid go up and down I used DOT 5 2 times and never again, I think you are one lucky person,getting good results, but then again in might have someting to do with where you live, just my 3 cents worth 37RAGTOPMAN TomO 08-27-2010 @ 7:30 AM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 Silicone fluid works very well in a good brake system. The most common problem people have with Dot 5 is getting a firm pedal. Dot 5 does not affect the rubber or leak from good connections. It does not attract water or cause the brake cylinders to fail. I have had Dot 5 in my car since 1980 and when I replaced the shoes this Spring, I honed the cylinders and put new rubber parts in the wheel cylinders. The honing was done to break the glaze and put a seating surface in the wheel cylinders as there was no pitting in any of them. IMHO Dot 5 works better in a seldom used car then Dot 3 because of the accumulation of water in an open system with Dot 3. The moisture tends to boil out of the system when you use the car as a daily driver, but accumulates when parked. Tom deuce_roadster 08-26-2010 @ 9:10 PM reply profile send p.m. Member Posts: 284 Joined: Oct 2009 37Ragtopman, Shoes were Ford script but yes, they had been relined locally in the Seattle area (bonded) and arced to drums. Drums were less then .050 wear. Don't know how you would check to see if the lining is too thick, maybe I should have used worse drums (not really!) But this was definitely the problem here as everything else was new. Pistons being pushed too far back. 37RAGTOPMAN 08-26-2010 @ 5:30 PM reply profile send p.m. Senior Posts: 1959 Joined: Oct 2009 deuce roadster. on the brake relined brake shoes,? were the shoes repros? with new lining? or original shoes,with new lining? it always to play safe. and AWAYS COMPARE REPROS to the ORIGINALS, I suspect that the shoes were repros and were just a little longer then the originals. just my 3 cents worth, but really would like to know. 37RAGTOPMAN

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