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Master Cylinder question

April 23, 2025, 05:05:32 pm by zieg85
Views: 442 | Comments: 3

I eventually will be converting my 67 Ford Custom to front disc brakes but I am not ready. I find myself needing a master cylinder in the meantime. Other than the 2 reservoirs holding a different volume of brake fluid is there any reason I can't install a disc brake master versus the 4 drum version?

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No fluid at rear brakes

April 18, 2025, 12:48:55 pm by AJS240 | Views: 2182 | Comments: 2

I'm working on a 1985 GMC K1500 truck (drum rear, disc front) brakes. I've replaced all of the steel lines (pre-bent kit) and rubber hoses, master cylinder, and rear wheel cylinders. I bench bled the master cylinder before installing. I removed the proportioning/combination valve from the chassis, removed the rear properning valve and cleaned it. The valve looks good and the two rubber seals on the proportioning cylinder look good. I bench bled the proportioning valve and centered the piston and have the GM centering tool installed.

With all of this the front brakes bleed fine and have plenty of pressure. I get very little flow at the rear and nearly no wheel cylinder piston movement after bleeding the rear. I get a little more flow at the union on the rear line part way up the frame when I test there. At the combination valve outlet to the rear I get decent flow (not as much as the front). The pedal is very firm and does not go to the floor.

Is there a spacer between the brake booster plunger and the brake master cylinder on these vehicles? Any other advice on how to proceed.

Thanks

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Reproduction Dog dish center caps?

April 16, 2025, 04:06:00 am by berserk
Views: 2674 | Comments: 6

Are there Dog dish center caps being reproduced right now for 73 -87? I have looked all over Google shopping, truck Forum searches and can't find anything. It doesn't make sense, we can get pretty much everything reproduction for this truck including rally wheel center caps but I can't get reproduction dog dish caps?

I don't do eBay, PayPal or Or anything virtual payment. I will order from reputable websites with credit card though though . I have hit the local classic Auto parts swap meets in Oklahoma and there's almost no square body parts to speak of. There are a few dog dish caps floating around but they're generally for c10s.

If has a source for reproduction dog dish center caps that will fit on Dana 60/14 bolt please let me know please!!

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1987 R20 w/454 TBI motor not starting after heavy rain

April 12, 2025, 01:29:38 pm by JensenHealey | Views: 3537 | Comments: 3

I have been struggling with a no-start issue on my 1987 R20 with 454TBI motor after a heavy rain storm. I have tried replacing the ignition wires multiple times with no change in behavior. The weather has to pretty warm for a day or two after a rain storm for the truck to start again. Today is two days after a rain storm here but the temps have been in the high thirties or low forties so today I am still stranded with a non-starting truck.

BTW, if I pop the hood, remove the air cleaner assembly and carefully watch the TBI injectors while cranking the motor I do see fuel being squirted into the TB so I am fairly well convinced it is an issue with the spark rather than a fuel problem.

On dry days the truck always starts quite easily.

Any suggestions would be most welcome.

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Rpm specific vibration above 2600 rpm

April 10, 2025, 05:17:11 am by berserk
Views: 4540 | Comments: 6

I hijacked my own thread that was of a different topic to try and get some help with this issue. But some new symptoms appeared and I figured this deserved its own specific post.

I have had this issue for a year now, above 2600 RPM a vibration starts in the floor board and cause my T case shifter to vibrate loudly.

It is 100% rpm related as I can replicate it at any speed as long as the gear I am in is above 2600 RPM. The vibration intensifies the higher in the rpm band I am in

I checked/ fixed, pinion angle, complete rear drive line rebuild and balance, T case mount, T case output yoke and bearing and the issue stayed.

But tonight on the way to work I tried something new, I put the truck in neutral at a stop light and revved the engine to 3000+ rpm and held it there and....the vibration started badly. Shook the T case shifter and floor board significantly, and I was sitting completely still.

Obvious things to check would be balancer, clutch fan, flex plate. But I'm kind of worried it may be the torque converter or in the transmission.

Anyone have ideas of other possibilities, signs to check for these issue Or similar experiences?

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