master cylinder opinions

[L05edSS]

the current 1 in my 86' ss as far as i know is a factory part, never changed in 21 yrs i've owned it & has around 72k miles. i've been thinkin its prolly time to do so with old seals and what not. brakes currently work fine and recently was spooked by new parts failure that almost cost an engine. few months ago seen this

and got me thinkin what do i do press my luck with the original part, press my luck with whatever is out there in secondary market or go with a premium brand like wilwood? what are you guys doin? i'm gonna need a power booster too. not looking to go crazy with brakes as i'm fine with factory style brakes and those were done in 19'.

 

[malibudave]

I think that you could do better with a newer style GM master cylinder.

The stock, factory original master cylinder is a step bore design with a 24mm pressure bore and a 34 or 36mm volume bore. The step bore master cylinder is used in conjunction with the from the factory, never been changed, front calipers. Most of the time, these master cylinders give you a longer, vague pedal stoke because of its design.

I would change out the front calipers with new replacements along with new rubber lines front and rear or stainless braided line front and rear.

A replacement master cylinder I would go with would be part number MC390572. This master cylinder has a 1.0" bore and comes on a right hand drive, 2000 S10 truck. This should have the correct outlet sizes to mate up to your existing brake line fittings (1/2-20 rear port and 9/16-18 front port)

Another option is from a 2003 Chevy Trailblazer. It is the same as the part number above, but both ports have a 1/2-20 outlets. For the front port you can use adapter from AGS, part number BLF-20C.