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I have a 2007 Toyota Tundra CrewMax 4WD with just under 98K…

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Hello - I have a...
Hello - I have a 2007 Toyota Tundra CrewMax 4WD with just under 98K on the odometer. I was wondering if the following issue was ever resolved:https://www.justanswer.com/toyota/7cpne-tundra-just-put-pads-rotors-front-buddy-s.htmlI have the exact same problem. I changed front pads at about 88K and never opened the brake lines, but now my brake pedal goes slowly to the floor over the course of about 5 to 10 seconds. I can still stop the truck and with normal stopping pressure to the brake pedal it will not sink. But if I press real hard it will slowly go to the floor. Luckily it holds the truck in place even when the pedal is on the floor. I have purposely activated the ABS wondering if cycling the ABS pump would fix it but no luck. I also tried lifting the pedal real fast after it hit the floor and pumping it a few time before giving it the steady pressure again. No luck there either. In the above link there was reference to a master cylinder piston seal becoming damaged and slowly leaking brake fluid back into the reservoir. Is this the likely fix? Any idea if there is a seal kit or do I need a whole new master cylinder?
Submitted: 6 months ago.Category: Toyota
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Answered in 3 minutes by:
12/8/2017
Toyota Mechanic: john, The Car Guy replied 6 months ago
john
john, The Car Guy
Category: Toyota
Satisfied Customers: 17,104
Experience: ase tech over 15 years in the field
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have you checked the system for leaks?

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Customer reply replied 6 months ago
I have never added fluid nor changed it the entire time I have owned the vehicle and I am the only owner. There are no leaks at the master or wheel cylinders and the reservoir is full.
Toyota Mechanic: john, The Car Guy replied 6 months ago

then yes the likley failure is the master cylinder

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Customer reply replied 6 months ago
In what way? A blown seal or o-ring? How do I bleed the system if I change or rebuild the master cylinder? Is there a technique where I can change the master cylinder without a system bleed?
Toyota Mechanic: john, The Car Guy replied 6 months ago

yes internal bypass usually just as easy to replace them i am not aware of any rebuild kits for the master cylinder...you can pull it apart the piston assembly locks in with a snap ring... But we always just replace them and bench bleed and they are good to go

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Customer reply replied 6 months ago
When you say bench bleed is that for just the master cylinder or does bench bleed include the brake lines? It sounds like I can replace the master cylinder without bleeding the brake lines if I am careful and use the bench bleed method. Is this true?
Toyota Mechanic: john, The Car Guy replied 6 months ago

yes bench bleed is bleeding the master cylinder on a bench thats where the name bench bleed comes from..if your carefull the whole system does not require bleeding

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Customer reply replied 6 months ago
Thanks. How do I avoid introducing air to the brake lines when I disconnect them from the master cylinder? Or introducing air when I reconnect them?
Toyota Mechanic: john, The Car Guy replied 6 months ago

both but usually its easy and simple just dont rattle the lines to bad when ya seperate and u will be fine

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Toyota Mechanic: john, The Car Guy replied 6 months ago

how did u make out

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Customer reply replied 6 months ago
Have not tried yet, will likely do so next weekend.
Toyota Mechanic: john, The Car Guy replied 6 months ago

best of luck any questions feel free to respond

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