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> ST to GT brake conversion
post Feb 10, 2016 - 3:36 PM
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bryanf



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I finally got my brake conversion done and wanted to share some details. Brakes must be one of the Celica ST's weakest points. Or one of its best opportunities for improvement.

I got Celica GT rear backing plates with parking brake cables, a proportioning valve, plus four rear caliper bolts from ebay seller rude-day. The transaction went well and I would definitely buy from him again. The prop valve isn't essential but it's a good idea.

After receiving these parts I disassembled, cleaned, lubricated, and reassembled the parking brake assemblies.



You can use new or used calipers and rotors. I decided to buy all new ones.

I got four new Brembo rotors. Here they are masked off and ready to paint:



The GT front rotor will bolt right up to the ST suspension. The disc just barely touches the rear brake shield and it's easy to bend it back slightly by hand.



Painted discs:



GT front brake rotors are much bigger than ST rotors. I've gone to significant expense and effort to do similar brake conversions on Datsun 510s and 240Zs over the years, so it always surprises me when someone says this conversion is not worthwhile. To me, since it's an easy bolt-on, it's irresistable.



First step in the rear brake installation is to disconnect the parking brake cables. The connection is inside the tunnel above the exhaust system. Make sure to release the hand brake. Remove the heat shield which is held in with four bolts, then disconnect the front ends of the cables. Working space was a little bit tight but I did not need to move the exhaust system.



If your brake drums don't come off easily, find a couple of 8mm bolts which will thread into the holes in the drums. Run them down evenly until the drum comes off. With the drum removed, you can see the bolts that hold the spindle and backing plate onto the hub.



Spindle removed:



There are thin O-rings beneath the spindle. Be sure to keep track of them and reinstall them during reassembly. Replace them if they are brittle or damaged.

Drum brake backing plate removed:



Disc backing plate installed and held temporarily by one bolt while I checked the fit of the hand brake cables:



Spindle, rotor and caliper installed:



You'll need the proper brake hoses for the rear discs; the drum brake hoses won't work.

Front brakes installed. These brake hoses are interchangeable.



Car on scales. I recently installed Megan coilovers and wanted to check corner weights.



Weights with full tank of fuel and no occupants. With no adjustment of coilovers at all. Not bad.



This post has been edited by bryanf: Mar 29, 2022 - 9:53 PM


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Posts in this topic
- bryanf   ST to GT brake conversion   Feb 10, 2016 - 3:36 PM
- - jesse09   Great write up. Looks clean. Recently did mine as...   Feb 10, 2016 - 11:36 PM
- - CelicaDICE   Excellent write up! Now you can swap to the A...   Feb 11, 2016 - 7:57 AM
- - bryanf   QUOTE (jesse09 @ Feb 11, 2016 - 12:3...   Feb 11, 2016 - 2:56 PM
|- - jesse09   QUOTE (bryanf @ Feb 11, 2016 - 2:56 ...   Feb 12, 2016 - 7:51 PM
- - BonzaiCelica   Only the GT4 has a different part # for that valve...   Feb 11, 2016 - 8:43 PM
- - BonzaiCelica   trying to install a proportion valve isn't har...   Feb 13, 2016 - 12:03 AM
- - bryanf   Got this from a testing spec in a Celica manual. I...   Feb 13, 2016 - 9:42 AM
- - HectortheRican   Could you find it in your heart to do a quick writ...   Feb 17, 2016 - 12:18 PM
|- - bryanf   QUOTE (HectortheRican @ Feb 17, 2016 - 1...   Feb 17, 2016 - 3:42 PM
|- - HectortheRican   QUOTE (bryanf @ Feb 17, 2016 - 1:42 ...   Feb 19, 2016 - 1:08 AM
- - msk59   Many thanks Bryanf for this post. I almost have ev...   Feb 18, 2016 - 4:29 PM
- - bryanf   Brembo rotor part numbers: Front: W0133-1818688 (...   Feb 18, 2016 - 8:03 PM
- - msk59   Thank You for the part numbers. Much appreciated.   Feb 19, 2016 - 11:36 AM
- - bryanf   The prop valves have different markings on the bac...   Feb 23, 2016 - 5:43 PM
- - Tigawoods   it would make sense that the GT and ST had differe...   Feb 24, 2016 - 8:21 AM
|- - HectortheRican   QUOTE (Tigawoods @ Feb 24, 2016 - 6...   Feb 24, 2016 - 3:05 PM
- - bryanf   I should have mentioned these are non-ABS parts.   Feb 24, 2016 - 12:44 PM
- - richee3   Different part numbers. GT is 47150-20240 and ST i...   Feb 24, 2016 - 3:57 PM
- - Bitter   The difference is because disc and drum rear brake...   Feb 24, 2016 - 5:00 PM
- - jesse09   I reused my ST Valve when upgrading to Front Avalo...   Feb 24, 2016 - 5:25 PM
- - yagamius   Since I'm sticking to My Celica I'm planin...   Mar 4, 2016 - 2:02 PM
|- - HectortheRican   QUOTE (yagamius @ Mar 4, 2016 - 12:0...   Mar 4, 2016 - 6:54 PM
- - bryanf   These are the calipers I used: left Centric 141.4...   Mar 4, 2016 - 4:32 PM


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