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Old 05-08-2012, 09:36 PM
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which port is front and rear on the master cylinder?

generaly speaking I have seen that the port that leads to the large reservoir goes to the front disc brakes and the small reservoir goes to the rear drums.

but when connecting the master cylinder of my son's Ford Granada, the front lines fiiting size fitted only the small reservoir side at the front side, and the rear lines fitted only in the rear side of the reservoir which is the larger size.

what is going on here?

the brakes are fine, but I keep wondering why is this?

when I pump the brakes the fluid level barely goes down on the small reservoir so I don't fear sucking air while braking, but just don't seem right to me.

any thoughts?
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Old 05-09-2012, 04:23 AM
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Are there any sort of adapter fittings in the MC? Of course, the lines could have had their fittings replaced, but that's a lot of work to go through to install the MC wrong. Only reason I can think of for that to have happened is if the MC isn't the right one for the vehicle.

The main problem I see if the drum side of the MC was plumbed to the discs, is if there's a residual pressure valve in the MC, the discs could drag, or if there was a proportioning valve the bias could be off. Otherwise, if that's not the case the only downside is as the pads wear, brake fluid will need to be added to keep the level up, and when it comes time to replace the pads, brake fluid will need to be removed from the reservoir before the pistons are retracted or the brake fluid will overflow.

I have no idea if the bores are the same between discs and drums on that vehicle, either. If the bores ARE different, the brake bias front to rear will be off.

Have you looked online for a diagram of that brake system to see if the MC/reservoirs are plumbed correctly the way yours is now?
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Old 05-09-2012, 09:47 AM
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there are no adapter fittings and the bore is straight, no residual pressure valve either, and the proportioning valve is routed correctly, the brakes work fine, I was just wondering if there was any potential problem.

you are rigth about the fluid level going down as the pads wear, I'm gonna tell my son to always keep a close eye on the level, and add as needed.

I haven't looked at a diagram but following the lines they are correct.

the best bet is that the master cylinder is not correct for this car, but if it ain't broken don't fix it !! when it comes time to replace it I'll seek the right one.

thanks a lot amigo, you are always helpful, best regards from the middle of the world.
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Old 05-09-2012, 11:06 AM
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I always read your posts- often as not there's something to be learned about making do w/parts that aren't bought from Summit, etc. and that's something I can appreciate. Heck, most anyone can pull out a credit card and spend their way through a problem. A hotrodder can make do w/a lot less!
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Old 05-09-2012, 12:30 PM
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Quote:
Originally Posted by Augusto
generaly speaking I have seen that the port that leads to the large reservoir goes to the front disc brakes and the small reservoir goes to the rear drums.

but when connecting the master cylinder of my son's Ford Granada, the front lines fiiting size fitted only the small reservoir side at the front side, and the rear lines fitted only in the rear side of the reservoir which is the larger size.

what is going on here?

the brakes are fine, but I keep wondering why is this?

when I pump the brakes the fluid level barely goes down on the small reservoir so I don't fear sucking air while braking, but just don't seem right to me.

any thoughts?
I seem to remember that there were some cars that were contrary to the standard of the larger cylinder going to the front.
Might have been one of Fords "better ideas"
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