Bad master cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**slepysal** · 11-08-2010, 01:02 PM

So I finaly got my brake line off , bent up a new one , buttoned up all the lines, modified my push rod (used parts off of my old clutch master rod) Installed the new rebuilt master cylinder ( bench bleed) and bled all four cornners.
My bro was to keep an eye on the resevoir making sure it wouldn't go dry, well I guess he thought I said " make sure your beer dosn't go dry" cuse sure as snot, the master goes dry while he was replenishing his cold one.
Try as I might I couldn't get the master to bleed right, so I took it off.
While bench bleeding I noticed that the rear port was not pushing the fluid . I removed the bleeder addaptors ,pushed the piston in , the front port shots out a stream of fluid , the rear port driped at best.
I bought the master 3 years ago, and lost the reciept , so went to autozone picked up a rebuilt for $16.95. But I cant work on it till this weekend, so my "quick" swap has turned into a 2 week project

JAUST A RANT

**slepysal** · 11-11-2010, 12:25 PM

Ok so I got a new reman master, bench bled it for days( no air) installed , bled the system.. No leaks but the pedal is a bit on the soft side, and it travles quie a bit before it stops. I don't think this is right. So can anyone give me some tips?

61_FL_Apache · 11-11-2010, 12:45 PM

I would bleed all 4 corners some more.

**slepysal** · 11-11-2010, 02:15 PM

I bled it with one of thse one man bleeder kits. I will do it the old school way and see what happens thanks

kalirodding · 11-12-2010, 03:41 AM

You can always try gravity bleeding it, if your trying to do it alone.

**slepysal** · 11-12-2010, 08:29 PM

Thanks I will bribe the kid to help me !!

dwcsr · 11-12-2010, 08:57 PM

Make sure your shoes are adjusted if your still using drum brakes. It will make the pedal feel soft if their out of adjustment.

**slepysal** · 11-12-2010, 09:00 PM

Quote:

Originally Posted by dwcsr

Make sure your shoes are adjusted if your still using drum brakes. It will make the pedal feel soft if their out of adjustment.

Thanks for that , I will make sure to check

skysoldier173rd · 11-12-2010, 09:22 PM

had the same issue. Got mine from autozone as well. The rear just seemed not to pump as well as the front. Finally found the shoes on the front were adjusted in too far and that affected the pedal big time. As soon as i got that adjusted in, pedal got better instantly. Mine is a 60 and the M/C i got from autozone was for a 67. Used an adapter plate from the good captain and the brake rod from the clutch side of old stock master cyl. The old brake rod was too short. Brakes work pretty well now. Tried to delete the next two blank posts, but had a misfire of some kind. Sorry.

skysoldier173rd · 11-12-2010, 09:25 PM

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skysoldier173rd · 11-12-2010, 09:29 PM

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'63GENIII · 11-13-2010, 11:22 AM

Quote:

Originally Posted by slepysal

Thanks I will bribe the kid to help me !!

I tried to bribe my daughter to help but found it to be cheaper to build a pressure bleeder out of a cheap home depot hudson sprayer and some air compressor fittings. Not that I have to bleed my brakes all the time, but when I was figuring them out, it seemed that I had to do it quite a few times until they were right. I needed to unstall some residual pressure valves from Wilwood because it turned out that the mc was a disc/disc type.

**slepysal** · 11-14-2010, 04:31 PM

bleed the system found that the front brakes were out of adjustment they spun freely.I adusted them , made sure the pushrod was adjusted too . It stops,but still feels like the pedal is too low.

**slepysal** · 11-16-2010, 12:37 PM

DONE!! After further adjusting of the push rod I now have good pedal . Oh and it stops fine .

**slepysal** · 11-17-2010, 03:52 PM

Quote:

Originally Posted by skysoldier173rd

had the same issue. Got mine from autozone as well. The rear just seemed not to pump as well as the front. Finally found the shoes on the front were adjusted in too far and that affected the pedal big time. As soon as i got that adjusted in, pedal got better instantly. Mine is a 60 and the M/C i got from autozone was for a 67. Used an adapter plate from the good captain and the brake rod from the clutch side of old stock master cyl. The old brake rod was too short. Brakes work pretty well now. Tried to delete the next two blank posts, but had a misfire of some kind. Sorry.

Did you keep your clutch hydraulic, I mean did you get the Capt.'s kit for maunal 60-62?

11-08-2010, 01:02 PM	#1
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Bad master cylinder So I finaly got my brake line off , bent up a new one , buttoned up all the lines, modified my push rod (used parts off of my old clutch master rod) Installed the new rebuilt master cylinder ( bench bleed) and bled all four cornners. My bro was to keep an eye on the resevoir making sure it wouldn't go dry, well I guess he thought I said " make sure your beer dosn't go dry" cuse sure as snot, the master goes dry while he was replenishing his cold one. Try as I might I couldn't get the master to bleed right, so I took it off. While bench bleeding I noticed that the rear port was not pushing the fluid . I removed the bleeder addaptors ,pushed the piston in , the front port shots out a stream of fluid , the rear port driped at best. I bought the master 3 years ago, and lost the reciept , so went to autozone picked up a rebuilt for $16.95. But I cant work on it till this weekend, so my "quick" swap has turned into a 2 week project JAUST A RANT __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " Last edited by slepysal; 11-08-2010 at 02:18 PM.

11-11-2010, 12:25 PM	#2
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: Bad master cylinder Ok so I got a new reman master, bench bled it for days( no air) installed , bled the system.. No leaks but the pedal is a bit on the soft side, and it travles quie a bit before it stops. I don't think this is right. So can anyone give me some tips? __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "

11-11-2010, 12:45 PM	#3
61_FL_Apache Who Me? Join Date: Sep 2010 Location: Royal Palm Beach, FL Posts: 4,067	Re: Bad master cylinder I would bleed all 4 corners some more. __________________ Steve 1997 Tahoe LT 4D 2WD (DD) 2001 Blazer 4D 2WD 1961 Apache 10 (sold) 1965 C10 Stepper (sold)

11-11-2010, 02:15 PM	#4
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: Bad master cylinder I bled it with one of thse one man bleeder kits. I will do it the old school way and see what happens thanks __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " Last edited by slepysal; 11-11-2010 at 02:19 PM.

11-12-2010, 03:41 AM	#5
kalirodding CLASSIX Truck Club Join Date: Oct 2009 Location: Lodi Ca Posts: 318	Re: Bad master cylinder You can always try gravity bleeding it, if your trying to do it alone.

11-12-2010, 08:29 PM	#6
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: Bad master cylinder Thanks I will bribe the kid to help me !! __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "

11-12-2010, 08:57 PM	#7
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Bad master cylinder Make sure your shoes are adjusted if your still using drum brakes. It will make the pedal feel soft if their out of adjustment.

11-12-2010, 09:22 PM	#9
skysoldier173rd Registered User Join Date: May 2010 Location: jackson, michigan Posts: 246	Re: Bad master cylinder had the same issue. Got mine from autozone as well. The rear just seemed not to pump as well as the front. Finally found the shoes on the front were adjusted in too far and that affected the pedal big time. As soon as i got that adjusted in, pedal got better instantly. Mine is a 60 and the M/C i got from autozone was for a 67. Used an adapter plate from the good captain and the brake rod from the clutch side of old stock master cyl. The old brake rod was too short. Brakes work pretty well now. Tried to delete the next two blank posts, but had a misfire of some kind. Sorry. Last edited by skysoldier173rd; 11-12-2010 at 09:30 PM.

11-12-2010, 09:25 PM	#10
skysoldier173rd Registered User Join Date: May 2010 Location: jackson, michigan Posts: 246	.. Last edited by skysoldier173rd; 11-12-2010 at 09:27 PM.

11-12-2010, 09:29 PM	#11
skysoldier173rd Registered User Join Date: May 2010 Location: jackson, michigan Posts: 246	..

11-14-2010, 04:31 PM	#13
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: Bad master cylinder bleed the system found that the front brakes were out of adjustment they spun freely.I adusted them , made sure the pushrod was adjusted too . It stops,but still feels like the pedal is too low. __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... " Last edited by slepysal; 11-14-2010 at 04:36 PM.

11-16-2010, 12:37 PM	#14
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: Bad master cylinder DONE!! After further adjusting of the push rod I now have good pedal . Oh and it stops fine . __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "



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