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Suspension & AxleTechnical discussions regarding alignment, stock and modified suspensions, lift kits, axles, hub conversions, gearing and steering.
This is a discussion thread titled "Is the Sequoia the only rear disc conversion available?", within the Suspension & Axle forum, part of the Technical & Vehicle Assistance Forums category.
The only time his rear brakes are problematic is when he has the boat in tow. The boat loaded is about the limit of the chassis and the rear brakes don't cut it...a front brake upgrade may be another option...
Adding disc's over drums with equal brake linings usually do nothing for a single stop...however with repeated stops the discs will stay closer to their maximum performance.
Being able to lock the rear brakes via the parking brake does not show anything about braking power.
Originally posted by alkemyst In a drum setup if you are braking heavy going downhill (automatic without the ability to manually transbrake) you can heat up the rear drum setup enough that even the parking brake will not lock them up. With a disc setup you still may not be able to lock them, but you will have alot more ability to stop.
The main advantage is a disc 'clamps' and therefore the force can squeeze stronger (for a basic explaination), with a drum the force must expand to stop and the cylinders have only a limited range.
Maybe Tundra Solutions is the wrong forum to ask modification questions as it seems everyone thinks the trunk rolled out fine from the factory and one must be crazy to change things. Is there a more performance oriented Tundra site?
not the wrong forum. i was seriously asking which valve because for various reasons i'd like to do this mod as well, 'cept i just got a hub conversion kit, and i'm working on another suspension mod next...brakes are a little farther off for me, that's all. i was thinking in addition to the sequoia under-hood valve, the land cruiser valving might work as well. the abs setup might be the hardest part, i would think...the sequoia has an addition channel over the tundra, so perhaps the lc hardware might be a better match. would the master cylinder need to be changed to account for a greater pressure requirement over drums?
I don't prefer ABS so I got my last car without them.
From what I read however, this conversion will work with the abs system. The proportioning valve (any type should work), simply adjust the fluid 'signal' the rear's get and you just dial it out or in so it locks up only when you are pedalling it too.
you will have to
replace everything outboard of the
axle tubes. The axles are the same for the Tundra and Sequoia. When you
have removed everything
needed for the conversion you will be left with the differential housing
and the splined ends of the axles
exposed.
You will need R and L caliper mounting brackets, R and L calipers, R and L
disc rotors, bearings, brake
pads, custom fabricated brake lines (to reach the calipers in the new
position) and a brake proportioning
valve (available at most performance shops).
If you have four wheel ABS you will need to modify the ABS wiring to reach
the sensors in the new location.
The best way to proceed is to go to your local Toyota dealer and ask him to
bring up the schematic for
the Sequoia rear brake system. Every part you will need is in the diagram
along with the part number.
The brake line can be fabbed up by taking your existing line and measuring
the distance to the new
caliper fittings. Then remove the line (just the metal line that run along
the differential) and take it
along with your measurements to a specialty shop that can fabricate a new
line that will fit.
The brake proportioning valve is mounted up by the master cylinder and is
used to up the pressure
going to the rear brakes since the disc require more than the drums. Do
not use a Sequoia master
cylinder or ABS controller because they are set up for a 4 channel ABS
(Tundra has 3) and stability
control functions your Tundra doesn't have.
I believe you will need the line lock to have any sort of parking brake.
That right there is the biggest reason Toyota still uses drums on the rear of the Tundra. If you have a large load parked on a downhill or uphill slant using the parking brake, the drum is far superior. So much so that GM just dropped the disc from the rear of the light truck line and replaced them with drums again. Seems they could not get a disc parking brake to hold the load. If you are depending on your transmission in park to hold a real load on a hill, you are looking for trouble. You need a strong dependable parking brake just like the one in our rear drum Tundras.
Also, drum brakes really are better suited for rear brake applications, especially with a proportioning valve, simply because they have a huge surface area compared to a disc. The only downfall has been described here ... repeated use brake heating and fade.
Phil
__________________ 05 White TRD D-Cab, SR5, Limited slip, 20" TRD Enkei's with BFGoodrich G-Force TA NT, All weather guard package, factory rear privacy glass with matching front door tint, Toyota bedliner plus bed mat, Toyota/A.R.E. color keyed tonneau cover, overhead console with temp, compass and Homelink, Toyota/Gentex electrochromatic mirror, keyless, mats, TRD aluminum front skidplate, Toyota/Bazooka VSE 100 watt self-powered subwoofer, TRD stainless exhaust tip, door sill guards, Custom TRD matched pin striping with Toyota logos, painted calipers with TRD letters, TRD billet aluminum third brake light cover with true TRD letters, Pioneer AVIC D-3 GPS head unit with IP Buss controlled Pioneer XM radio tuner and iPod interface, Pac remote(maintains steering wheel controls) Polk Audio speakers DB675 two way in rear, Polk DB6750 components in front powered by a Polk C400.4 4 channel amp, seperate amped Aura Pro Bass Shakers under each front seat, Bazooka EL series 8" 100 watt self-powered subwoofer with Polk Momo driver with quick disconnect, Memphis tweeters in rear, back-up sensors (very handy), foglight mod, Sylvania Silverstars in both head and fog lights, added rear halogen back-up lighting, BellTech 6700 1" lowering shackles, Hellwig anti-sway bar, Magnaflow 14586 Stainless muffler, Wheelskins two-tone leather steering wheel cover, Ventvisors for side and rear windows, custom lower grill insert, Hoppy tailgate spring. More to come!
Anyone have any recent feedback concerning the rear disc brake conversions? Most of the posts are from 2002. I need to replace my rear brake shoes and cylinders, so I'm looking at doing the conversion (on my 2000 ABS equipped truck). I just had the axle seals replaced with the new designs. Will converting to rear discs require removing the axle seals again?
Re: Is the Sequoia the only rear disc conversion available?
I have the rear disc conversion on my Tundra but if i was to do it over I would just go with the big brake Stop Tech conversion for the front .
Go to www.boostedtundras.com to find a link to URD They have great prices for this conversion
Re: Is the Sequoia the only rear disc conversion available?
there are currently at least three bolt-on disc conversions for a tundra. two of them I THINK will allow an abs-equipped truck to continue using the abs, that would be the sequoia and the sos conversions, since neither touch the axle shafts--the abs sensor ring (aka tone ring) is pressed on to the semi-float axle shaft.
if you dont have abs, i'd recommend the front range offroad kit, since it is a disc brake conversion with a parking brake-equipped caliper and is primarly a full-float conversion--the disc is secondary to the full float vs semi-float trade.
there is another option for rear discs if you have a good reason and are willing to spend the money...precision brakes makes (recently) a parking-SPECIFIC secondary caliper for use with rear disc conversions when an internal drum or driveline brake is inappropriate for the application, like parking a heavy load on a steep hill or parking an oversized tire anywhere.
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