Sequoia Master Cylinder Swap, Brakes Dragging?

billygoat · Oct 29, 2022

I swapped

Yo'ta · Sep 26, 2020

If one wheel dragging it's possible you have a partially collapsed rubber brake line that it not allowing the system to fully depressurize that caliper.

Have you checked each individual wheel for brake drag or is it all wheels?

JL

billygoat · Sep 26, 2020

Yo'ta said: ↑

If one wheel dragging it's possible you have a partially collapsed rubber brake line that it not allowing the system to fully depressurize that caliper.

Have you checked each individual wheel for brake drag or is it all wheels?

JL
Click to expand...

It’s all 4 wheels

Yo'ta · Sep 26, 2020

any chance there is any air in the hydraulic lines?

hemitruk · Sep 26, 2020

You ordered master cyl from sos or on your own . Took a specific year forgot what it was . Also free play needs to be correct . Not enough free play when brakes get hot fluid will expand and engage brakes . I know the kit has 2 bolts for the free play .A short bolt and longer one . I used short first but ended up using longer one .
Also suppose to be tundra master . Guess they are same (sequoia) ?

billygoat · Oct 29, 2022

hemitruk said: ↑

You ordered master cyl from sos or on your own . Took a specific year forgot what it was . Also free play needs to be correct . Not enough free play when brakes get hot fluid will expand and engage brakes . I know the kit has 2 bolts for the free play .A short bolt and longer one . I used short first but ended up using longer one .
Also suppose to be tundra master . Guess they are same (sequoia) ?
Click to expand...

The SOS kit came with a master cylinder, I didn't get to choose it

hemitruk · Sep 27, 2020

billygoat[OP] said: ↑

The SOS kit came with a master cylinder, I didn't get to choose it, I just specified the year of Tacoma (2005, so 05-08 kit). I increased free play to the point that I ended up not using either screw. The problem definitely is not coming from the fluid expanding from heat. The problem arises after pushing the brake pedal just a few times, I don't even have to back out of the driveway for it to happen and the pressure is still there in the morning.

I did some googling and it sounds like cheap aftermarket master cylinders are notorious for having residual pressure valves that maintain too much pressure in the lines and cause brake drag. It honestly sounds like a defective master cylinder was included in the kit. I emailed Tom over at SOS, hopefully he'll have a solution. For the price of the kit I honestly expected a higher quality master cylinder...I didn't even see an indication of the brand anywhere on it. $300 is a lot for a generic MC and two small adapters when a genuine Toyota brand master cylinder can be had for about $130 online.

My truck has been undriveable for nearly two months now...first it was the lower control arms so I swapped them out, then the rack and pinion started leaking so I swapped it, then the rear brakes needed replacing so I swapped in a rebuilt axle with discs and swapped the front carrier for lower gears at the same time, did an FJ case swap while I waited for axle parts to get here, decided to upgrade the master cylinder for the discs and now the dang master cylinder doesn't work right. If I keep asking people for rides I might find myself in a ditch somewhere. I just want this truck to be DONE.

edit: the pressure in the lines was gone thismorning, but when I pushed the brakes with the engine off it came back and stayed again
Click to expand...

Bummers . Hope things work out for you. Thought of swapping stock master in so at least you can drive it ?

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Sequoia Master Cylinder Swap, Brakes Dragging?

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billygoat [OP] Well-Known Member

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Yo'ta Well-Known Member

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Yo'ta Well-Known Member

#5
hemitruk Old man , young boi truk

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hemitruk Old man , young boi truk

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Sequoia Master Cylinder Swap, Brakes Dragging?

#1 billygoat [OP] Well-Known Member

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#4 Yo'ta Well-Known Member

#5 hemitruk Old man , young boi truk

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#7 hemitruk Old man , young boi truk

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billygoat [OP] Well-Known Member

#2
Yo'ta Well-Known Member

#3
billygoat [OP] Well-Known Member

#4
Yo'ta Well-Known Member

#5
hemitruk Old man , young boi truk

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billygoat [OP] Well-Known Member

#7
hemitruk Old man , young boi truk

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