My brakes are soft, but if I pump them, then they are tight again. The front right caliper is dragging. I replaced the caliper, but the same issue occurred. I believe it's the master cylinder. I have 260k miles, so it makes sense to replace it. I ordered the 47025-60041. I took the assembly out last night and opened the new box. Unfortunately, it's not the complete assembly. The 47050-60041 is the complete assembly. So now I have to deal with reordering, paying to ship the wrong part back, etc.. I have no idea why anyone would order the 47025-60041 since it's only $150 less than the complete assembly. Hopefully, the dealer accepts the Return.
Master Cylinder Assembly
- Thread starter crazyee33
- Start date
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I've yet to see a caliper, that needed replacing. Their seals, boots, etc., which are in the kits, perhaps a good idea. Some even a piston or two. But caliper itself does not cause drag on pads. Kit is really not going to fix drag either 98-100 times. They're about refresh of boosts and seals.
I did once have the brake masters ABS unit, have issues. That resulted in one corner (pads) braking. It would lock that corner the instant brake pedal pushed with IG key on. Not a drag. But full pressure braking on a single caliper/wheel.
Pump brake pedal has more to do with air in system, 8 out of 10 times. Can also be a result or compounded by, weak seal in master. Even piston seals, but to a lesser extent.
Most time pad drag. Is improper pad install. This happens very often. One reason so often. We tend to put things back together, the same way they came apart. But when dealing with used vehicle, someone else has worked on. They're not always assemble correctly, by hands that touched in the past.
Most notable in the fronts. Missing outer shims. These shims have clips that grab the pistons. Piston seal retractions as they uncurl. This pulls piston back in and thus pads off rotor. These shims, come in two PN/sizes. 98-02 to fit smaller pistons. 03-07 to fit larger pistons. Outer shims, each have large sizes and a small sizes clips. To fit the two piston of different size, within each caliper. That is the 98-02 have two sizes of piston. Two small and two large for each caliper. Same for 03-07, but they are larger set. Shims also have a clip/hook at bottom, pads hook/fit in. Also Fitting kit at top of pads. To hold pads to shims at top of pad. Final is anti rattle spring.
Also, Rotor runout and variation in thickness, must be within spec.
Wheel bearing must be tight. You can not have any play in wheel hub. To test this with tire off the ground. Grab tire at 12 & 6, try rocking tire to see if any play.
Brake fluid system must be proper flushed and bleed. Personally I only use Toyota brake fluid.
Rear brake. Well they take more than, slapping in pads. I come behind so many, that someone just tossed in pads. Not lubing pins or replacing boots, nor installing wear indicators and or R&R fitting kitting as needed. Pins often freeze up. Result pad drag and excessive wear. Or if rotor replaced. Not cleaning hub, Then runout out rotor to best.
Brake line inspection. One more area missing.
I did once have the brake masters ABS unit, have issues. That resulted in one corner (pads) braking. It would lock that corner the instant brake pedal pushed with IG key on. Not a drag. But full pressure braking on a single caliper/wheel.
Pump brake pedal has more to do with air in system, 8 out of 10 times. Can also be a result or compounded by, weak seal in master. Even piston seals, but to a lesser extent.
Most time pad drag. Is improper pad install. This happens very often. One reason so often. We tend to put things back together, the same way they came apart. But when dealing with used vehicle, someone else has worked on. They're not always assemble correctly, by hands that touched in the past.
Most notable in the fronts. Missing outer shims. These shims have clips that grab the pistons. Piston seal retractions as they uncurl. This pulls piston back in and thus pads off rotor. These shims, come in two PN/sizes. 98-02 to fit smaller pistons. 03-07 to fit larger pistons. Outer shims, each have large sizes and a small sizes clips. To fit the two piston of different size, within each caliper. That is the 98-02 have two sizes of piston. Two small and two large for each caliper. Same for 03-07, but they are larger set. Shims also have a clip/hook at bottom, pads hook/fit in. Also Fitting kit at top of pads. To hold pads to shims at top of pad. Final is anti rattle spring.
Also, Rotor runout and variation in thickness, must be within spec.
Wheel bearing must be tight. You can not have any play in wheel hub. To test this with tire off the ground. Grab tire at 12 & 6, try rocking tire to see if any play.
Brake fluid system must be proper flushed and bleed. Personally I only use Toyota brake fluid.
Rear brake. Well they take more than, slapping in pads. I come behind so many, that someone just tossed in pads. Not lubing pins or replacing boots, nor installing wear indicators and or R&R fitting kitting as needed. Pins often freeze up. Result pad drag and excessive wear. Or if rotor replaced. Not cleaning hub, Then runout out rotor to best.
Brake line inspection. One more area missing.
Hi,
I have read alot of your post regard mechanic issue and I found myself really educated, I have a question regard ABS Master Cylinder Compatibility questions, could you please check my post and provide me with some ideas? I would appreciate you alot!!!
Thanks!
I found your thread and post in it!