Replacing master cylinder and break booster

[Gjeep123]

The 88 Comanche Laredo I just bought sat for several years with very few miles put on it. So I drove it a couple of days and breaks went out. Assuming it’s the master cylinder and possibly the break booster as well. Does using new parts that aren’t original 88 parts diminish the value? My neighbor could also help me tear down and rebuild the engine. It really runs good not using oil. It’s got 170k on it so I thought I might want to. It would be cool to get my hands dirty and learn some. Would this diminish value? I’m obviously a novice, but I’m really loving this truck. Thanks for all your help 

[jdog]

it will not diminish the value, inspect or replace all the lines/rubber brake lines as well

[Dzimm]

I'd recommend upgrading it to the later dual diagram booster and master to get better braking and no it won't hurt the value.  Could actually make it a better value to someone else if you go to sell.

 

At 170k there is no need to do anything on the engine if it's not having any issues.  If it's running good now it's got a long way to go before it needs major work.  You could go around and check hoses, the vacuum lines and such just to catch anything before it becomes a problem.  Tune-up and fluid changes would be highly recommended to do since it's new to you, you don't know the last time it was done.  This includes axles, transmission, transfer case, ect.  You could also do the valve cover gasket and oil filter adapter gasket if you wanted and just do a good once over on everything to see if you notice anything wrong.  I'd recommend doing all of Cruiser's tips as well to prevent and fix issues you may not know exist.

 

You won't hurt anything value wise for fixing and replacing worn out parts.  When you start making drastic changes or cutting up sheet metal is when you will take a hit to it's value.

[Minuit]

I'd argue that the brakes not working diminishes the value a hell of a lot more...

 

In your situation, I strongly doubt that the 95/96 booster will actually improve your stopping distance. What it will do is lower pedal pressure, which is a matter of preference and may give the illusion to some that the truck will stop in a shorter distance. The only time swapping a booster will actually improve the braking distance an inch is if you literally could not lock your front brakes before. A properly working stock booster/MC should be able to lock the front brakes no problem as long as the tires are approximately stock size - I know both of mine can. Switching to the 95/96 unit is a more involved job than simply swapping out parts.

 

What makes you think it's the booster/MC? Any fluid dripping on the ground? Any fluid coming out of the rear drums?

 

I'd say don't open up the engine if it sounds good and has good compression. I'd change gaskets to eliminate leaks at the most. Opening up a well-running engine is a path to trouble IMO.