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HI
I recently rebuilt my brake caliper with genuine toyota brake caliper rebuilt kit. I bought new bleeder screw from toyota also. I bled the system and put the new screw on and then test drove it. I found out that the bleeder screw threads is leaking or seeping brake fluid out so I used telfon tape. Am i suppose to use some kind of sealant when installing a new bleeder screw? the telfon tape stopped it from seeping out of the thread and I clean everything off now I remove the brake bleeder screw cap or the rubber thing there is little brake fluid in there? Can you help me? Btw, comparing to my Honda the sienna brakes are spongy but there is no air in the system. Honda are hard, the toyota one can brake hard and stuff but how come you can press the brakes downer.Thank you
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You shouldn’t have to use anything to install a new bleeder valve. Is it leaking from around the threads, or thru the valve itself? You might have gotten a bum bleeder valve. One thing I’ve learned to do is drive the vehicle before the brake service I do (of any kind), and re-testing the vehicle after the service, because every car has a different feel to the brake pedal. This way you have an idea of what it felt like for comparison. If you have a spongy pedal, and a known leak, you will get air into the system and get a spongy pedal. You may have to bite the bullet and buy a new or reman’d caliper. It sounds like someone has over torqued the bleeder screw/valve, if you had to add teflon tape to fix a leak. It will not hold up for too long. I’m not sure if it’s possible, but you could try drilling the hole out and retapping the thread for the bleeder screw, if they make a bigger one. I kind of doubt it though, and you will end up having to replace the caliper.
I know for a fact that I did not over torque the bleeder screw. Right now is it not leaking but on the bleeder screw cap there is brake fluid. I heard they use thread sealant for brake bleeder bolts.
Last summer I just installed rebuilt calipers and brackets in my 2000 Sienna and there’s no thread sealant on my bleeder screws. Just make sure that the leak is not coming from somewhere else and by chance collecting around the vicinity of the bleeder screw.
You should never use thread sealant on brake parts. Also, drilling out where the bleeder goes is will make it worse, as it’s not the threads that seal the caliper, it’s the taper at the bottom of the bleeder screw that seals against the bottom of it’s bore in the caliper. If I was to guess, it’s possible that you just got defective parts. I’ve learned over the years that the word “new” simply means Never Ever Worked. What you might want to do is get some remanufactured calipers from
and replace the ones that you rebuilt. Out of curiosity, why did you rebuild the calipers on your Sienna anyway? I don’t think I’ve ever seen one of those go bad before. [b][i]3 SheetsDiesel said:
the word “new” simply means Never Ever Worked[/i][/b]
Classic line, very funny. Good point about how bleeder screws work. Maybe there is some debris at the bottom of the hole, preventing it from sealing….
I think the bleeder screw is not seating correctly. What advise do you guys give me? BTW, how does a bleeder screw work? I know there is a tiny hole on the bottom of the screw but how does that hole seals. What cause the threads to leak? Is it because the bleeder screw is worn out. I just bought new bleeder screw from Kragen Auto Parts I hope it wont leak.
The issue with the bleeder screw could be down to defective parts as already stated or the treads on the caliper being cross threaded.
The only type of thread sealer i have seen on brake bleeder screws is the speed bleeders.
I would recommend installing the old bleeder screw, these actually seal by ‘seating’ inside the bore into a cone shape, if the shape of the bleeder valve is new and the cone inside the caliper had conformed to the old shape it will not seal properly with the new bleeder screw. BTW I don’t recommend rebuilding brake parts for this very reason as I often find that the old ‘hard parts’ have problems that don’t allow the new parts to work properly so in the future I would recommend replacement of those parts rather than rebuilding them.
As for the spongy pedal if you’re sure that you have all the air out and that your brake pads are installed correctly and all the caliper parts are working properly you might want to try this.
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