Rear Disc Brake Theory

This has been a long awaited topic amongst all, as we’ve all pondered and wished we had rear disc brakes. Unfortunately, Toyota didn’t see the demand for them in our US market.

I’ve spent countless hours researching and I’ve discovered that Toyota developed parts that use similar bolt patterns for certain parts. So I’ve noticed there’s a pattern on some cars with regards to their rear brakes…thus having the potential to have brakes interchangeable.

I have come to the conclusion that the following two setups will fit the rear of the RAV4.1’s in the US. I’d just like to note, since I’ve sold my RAV4 I can’t confirm these setups with work, it’s truly up to another brave RAV4 owner to give it a go!

The most difficult part of both setups is acquiring the back plate which is how it all comes together. These back plates are expensive from the dealer and can cost upwards of $300. The easiest way to do this is to swing by a local wrecker or junkyard and buy them there…make sure they are complete with the entire brake assembly.

Here’s what you’ll need:

– Backing Plates
– Drum Parking Brake Assemblies
– Drum Brake Pads
– Rotors
– Brake Pads
– Brake Shims
– Brake Calipers
– Brake Calipers Brackets
– Parking Brake Cables (may not need them as stock cable compatibility has not been confirm)

The first setup comes from our beloved family minivan, the Toyota Sienna specific the 3rd generation Sienna. While I unraveled these I discovered this setup is used on the rear of other Toyota and Lexus models:

TOYOTA SIENNA 2011-2015

TOYOTA HIGHLANDER 2014-2015

LEXUS RX350 2010-2015

LEXUS RX450H 2010-2015

Here’s a few photos of the major parts you’ll need with specs.

backingplate2 backingplate

2012siennarotors 2012siennacalipers 2012siennapads

Backing Plate Part Numbers:

LEFT REAR BACKING PLATE 46504-08020

RIGHT REAR BACKING PLATE 46503-08020

Caliper Bracket Part Numbers:

LEFT REAR BRACKET 47822-0E020

RIGHT REAR BRACKET 47821-0E020

Caliper Part Numbers:

LEFT REAR CALIPER 47830-0E020

RIGHT REAR CALIPER 47850-0E020

 

The second setup comes exclusively from theToyota Rav4.2 or simply the 2nd generation Rav4. These are a bit harder to find do them being a less common option and less of them on the road. Note these setup does not require a brake caliper bracket as it was design to have less parts.

TOYOTA RAV4 2001-2005

rav4.2rotors rav4.2calipersrav4.2pads

Backing Plate Part Numbers:

LEFT REAR BACKING PLATE 46504-42021

RIGHT REAR BACKING PLATE 46503-42021

Caliper Setup Part Numbers:

LEFT REAR CALIPER 47750-42050

RIGHT REAR CALIPER 47730-42050

And if you don’t this is possible just check out our Rav4 friend in Russia

http://www.drive2.ru/cars/toyota/rav4/rav4_i/gte-starichok/journal/178490/#post

I have a partial Sienna setup for sale if anyone is interested…just shoot me an email or comment. To be continued….

 

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Front Brake Theory Pt. 2.5 – Stage 1 Brake Upgrade

I’d like to revisit my posts on brakes, as some questions have surfaced and I’d like to help answer them. For some people out there, my brake setup is not ideal because it requires some grinding for fitment and wheels spacers to use 16inch wheels…so, how does one still upgrade without having to do all that?

Well, good news is you still can upgrade from your stock setup still use your stock 16inch wheels. I haven’t had the funds or time to experiment with this and I can’t make an promises but I have a pretty good feeling this new setup will work.

Here is the Stage 1 Brake Upgrade:

Brake Caliper with Bracket – Celica ST (95-99)

Part Numbers:

RH 47721-20370 or 47721-20371

LH 47722-20080 or 47722-20081

stcelicabrakecaliper1stcelicabrakecaliper5

Rotors – Lexus RX300 (99-03)

Part Number: 43512-48011 or 43512-48060

rx300brakerotorrx300brakerotor1

 

Pads – Celica ST (95-99)

Part Number: 04465-20140 or 04465-33021

stcelicabrakepads

I can’t confirm any modifications will be needed but if it does, it will be less then my Stage 2 Brake Upgrade. This setup will feel and work just fine with the stock brake master cylinder.

Master Cylinder Selection

After using my upgraded brake setup for over 2 years now, I’ve begu to research again and source farther potential upgrades. As I mentioned previously, this particular setup increased pedal travel and I had recommended using a larger brake master cylinder. This is of course if you don’t like how the brakes feel. I’d like to state its not necessary as the stock master cylinder has been tested to work for more then 2 years…especially if you’re working with a tight budget, which most of us are.If have to ask yourself, that type of pedal feel do you want and how do you want the brakes to response. Now with that said here’s what I’ve gathered so far.

I always like to begin with a reference diagram of the original parts (brake master cylinder circled in red):

sxa10stockmr2toyotadiagram

The stock Rav4 brake master cylinder has a inner bore of 7/8″ inches. NOTE – I circled the front brake line outlet as this became a vital sourcing a direct bolt on upgrade.

sxa10mc3 sxa10mc2 sxa10mc1

There are two master cylinder upgraded there are direct bolts on’s…

Subject A

The ST204 1994-1999 Toyota Celica with a bore size of 15/16″ inches.

OEM Part Number # 47201-2B090

st204mc3st204mc2st204mc1

Subject B:

The MCU10 1999-2000 Lexus RX300 with a bore size of 1″ inch.

OEM Part # 47201-48030

rx300mc3rx300mc2rx300mc1

A little general advice about selecting bore size in your master cylinder may be helpful… Decreasing MC bore size will decrease your pedal effort and increase your pedal travel. Conversely, a larger bore in your car’s master cylinder will, all other components being consistent, increase your pedal effort and decrease your pedal travel. As with some other brake parts purchases, this comes down to your preference for how the brakes “feel” under foot when you are driving.

To complete this master cylinder swap, you’ll simply have to use the Rav4 brake fluid reservoir with new seals, bolt it all up, pour some fresh fluid and bleed the brakes.