Bendix 2231532 BMC

[Frankenchevy]

I’m wanting to rebuild or replace my brake master cylinder. Nothing malfunctioning, but for the sake of preventative maintenance.

There are three listings for master cylinders from Napa on a k30. I think the last one, p/n M2533, is the hydro boost/diesel option; but the reservoir cap states “DOT3 ONLY”:

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If I look at my brake master cylinder, it is p/n 2231532. My reservoir cap states “DOT5 ONLY”

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When I google those they go for close to $500. What gives? Am I missing something?

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Finally, is the a rebuild/seal kit specific to dot5? I was always told that if a system is thoroughly flushed, it can run any fluid type ie dot 3/4, dot5 and dot5.1. Albeit extremely difficult to fully remove all of one type of fluid.

 

[73c20jim]

Stay away from DOT 5. DOT 5.1 is OK. I don't remember why. Maybe someone can help.

 

[ajd89]

I thought dot 5 was the way to go...

 

[73c20jim]

https://www.epicbleedsolutions.com/resources/faq/difference-between-dot4-and-dot51-brake-fluid/

https://www.steelsoldiers.com/showthread.php?172595-DOT-5-vs-5-1-What-are-you-using

Do your own research before you decide.

 

[Craig 85]

I bought the M2533 for mine. I don't like using rebuilt M/C's. I still have the M/C that came on my truck and it has the same casting number, but the pre-fix is 128. There is some other casting to the right of the main cast number, but it doesn't have enough detail to read.

I've had 5 GM trucks up to 2004 model year with hydro-boost. All of them ran DOT-3 and I've never had any issues even towing travel travelers over the Sierras.

 

[CSFJ]

I picked up an extra MC for my truck off ebay. found some new old stock surplus pieces. might be worth a look.