Early 90 GS-T caliper fitment issue.

[half-cocked]

I am replacing the front calipers with stock replacment from a local autoparts store and I am having a fitment issue with the calipers bolting to the knuckle. After reading some in the FSM I found that there was a change in the brakes during the 90 model year, and I happen to have a very early 90 GS-T. I am looking to see if someone can give me confirmation if the actual knuckle bolt pattern/spread is different from the later 90 cars.

Thanks
Dan

 

[pneumo]

I am replacing the front calipers with stock replacment from a local autoparts store and I am having a fitment issue with the calipers bolting to the knuckle. After reading some in the FSM I found that there was a change in the brakes during the 90 model year, and I happen to have a very early 90 GS-T. I am looking to see if someone can give me confirmation if the actual knuckle bolt pattern/spread is different from the later 90 cars.

Thanks
Dan

I'd recomend that you get your original calipers rebuilt. The early 90 used the same brake pad as the double piston big brake found on the later AWD cars. The later years FWD brakes actually have smaller brake pads than what you have now. Your rotor is also 270mm (10.7 inch), which is the same as the AWD big brake rotor. If you swap to the later year FWD caliper you also need to get the smaller rotor.

Essentially you have single piston big brakes.

According to CAPS all 1G's use the same knuckle. If you want to use those calipers you'll need to get the caliper mounting bracket, too.

 

[half-cocked]

OK, the caliper not fitting makes sense now. I didnt know there was a rotor size difference with the brake change over. If the later rotor was smaller than the the earlier one it would make sense for the later caliper mounting bracket not to line up, its supposed to go over a smaller rotor.


Thanks for the info, BTW what version of CAPS are you using? On mine if you look up the the knuckle, we will use the left one for the example, it comes up with part # MB518137 and right below it it has Replacment Part # MB518139. Maybe I'm just reading CAPS wrong, but wouldnt that signify a parts change?

 

[pneumo]

Thanks for the info, BTW what version of CAPS are you using? On mine if you look up the the knuckle, we will use the left one for the example, it comes up with part # MB518137 and right below it it has Replacment Part # MB518139. Maybe I'm just reading CAPS wrong, but wouldnt that signify a parts change?

My version of caps shows the same thing. MB518137 was the original part number, then it was replaced with MB518139. It also shows MB518137 was also used on some cars in later years and was also replaced with MB518139. The only cars to use MB518137 were non-ABS. All 1G's now use the updated part, which is ABS compatible.