Just Another Kiwi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Robin Smith · 12-30-2015, 11:10 PM

I am having problems with my '66 C20 Chevy Truck, my brake pedal seems to want to load up every now and then, pedal comes up hard and overnight seems to back off. Truck has new M/C and all new Wheel/C fitted approx. three months ago, Truck is a daily driver, this problem has only started over the last couple of weeks. Any help would be much appreciated. Cheers, Robin.

Always use tasteful words, you may have to eat them.

Robin Smith · 12-30-2015, 11:17 PM

Quote:

Originally Posted by Robin Smith

I am having problems with my '66 C20 Chevy Truck, my brake pedal seems to want to load up every now and then, pedal comes up hard and overnight seems to back off. Truck has new M/C and all new Wheel/C fitted approx. three months ago, Truck is a daily driver, this problem has only started over the last couple of weeks. Any help would be much appreciated. Cheers, Robin.

Always use tasteful words, you may have to eat them.

Robin Smith · 12-30-2015, 11:21 PM

I am having problems with my '66 C20 Chevy Truck, my brake pedal seems to want to load up every now and then, pedal comes up hard and overnight seems to back off. Truck has new M/C and all new Wheel/C fitted approx. three months ago, Truck is a daily driver, this problem has only started over the last couple of weeks. Any help would be much appreciated. Cheers, Robin.

Always use tasteful words, you may have to eat them.[/QUOTE]

Johnny_Lamebridge · 12-31-2015, 01:26 AM

Original non-power brakes?

Lugnutz65 · 12-31-2015, 10:35 AM

My brakes would get very tight after a few minutes of stop and go driving. Then the brakes would start to drag. Turned out that my brake pedal push rod wasn't adjusted properly. The MC plunger was not returning fully to home position. Pressure would gradually build. Simple fix if that's the problem.

blown240 · 12-31-2015, 11:37 AM

Yup! I had the same problem with mine. Adjusted the master push rod and all is well now. You will probably need to adjust your shoes after you adjust the pushrod...

Robin Smith · 12-31-2015, 02:51 PM

Stock standard M/C no booster, I will check the pushrod and adjust (if needed), thanks for the feed back I will keep you all posted. Thanks Robin.

Robin Smith · 12-31-2015, 10:13 PM

How do I know how far to adjust the brake pedal push rod.
Robin.

Lugnutz65 · 12-31-2015, 10:41 PM

Quote:

Originally Posted by Robin Smith

How do I know how far to adjust the brake pedal push rod.
Robin.

Back off the nut that locks the rod into place. Back the push rod just enough so the tip is just a millimeter or 2 from contacting the plunger. Screw the lock nut into place to lock it again.

Robin Smith · 01-01-2016, 03:19 PM

Yesterday afternoon I adjusted the pushrod 2/3mm off the plunger (gave me about 10mm freeboard at the pedal) did up the locknut and went about a ten km drive, by the time I got home the brake pedal was pretty well loaded up, I left it over night and I have just come in from testing the pedal this morning and it is now back to where it should be, something tells me it could be a M/C problem, any ideas anyone. Cheers Robin.

jtrichard · 01-01-2016, 03:23 PM

sounds like a bad residue valve in the master .... time for rebuild

Robin Smith · 01-01-2016, 03:51 PM

New M/C July 2015, looks like I may have to get the hands dirty and dive in there to see what's going on....Robin

AcampoDave · 01-01-2016, 11:29 PM

If those rubber lines that go to the front weel cylinders and from the rear axle to the frame look old, replace them. They swell up internally.

Robin Smith · 01-11-2016, 03:36 PM

I have replaced the front brake hoses when I did the M/C the rear one seems to be okay, I will keep an eye on it.
I have readjusted the brake pedal push rod a Couple of times and I am pretty sure I have it where it seems to work properly now.
Thanks to everyone for all your input, I think we can put a lid on this episode now. Cheers....... Robin.

12-30-2015, 11:10 PM	#1
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Just Another Kiwi I am having problems with my '66 C20 Chevy Truck, my brake pedal seems to want to load up every now and then, pedal comes up hard and overnight seems to back off. Truck has new M/C and all new Wheel/C fitted approx. three months ago, Truck is a daily driver, this problem has only started over the last couple of weeks. Any help would be much appreciated. Cheers, Robin. Always use tasteful words, you may have to eat them. Last edited by Robin Smith; 12-30-2015 at 11:19 PM.

12-30-2015, 11:21 PM	#3
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi I am having problems with my '66 C20 Chevy Truck, my brake pedal seems to want to load up every now and then, pedal comes up hard and overnight seems to back off. Truck has new M/C and all new Wheel/C fitted approx. three months ago, Truck is a daily driver, this problem has only started over the last couple of weeks. Any help would be much appreciated. Cheers, Robin. Always use tasteful words, you may have to eat them.[/QUOTE]

12-31-2015, 01:26 AM	#4
Johnny_Lamebridge Registered User Join Date: Mar 2014 Location: Cambridge, Ontario Posts: 507	Re: Just Another Kiwi Original non-power brakes? __________________ * My 63 C10 SWB Fleetside (converted to BBW): http://67-72chevytrucks.com/vboard/s...58#post6851558 @johnny_lamebridge on Instagram

12-31-2015, 10:35 AM	#5
Lugnutz65 Registered User Join Date: Jan 2013 Location: Columbia, SC Posts: 1,927	Re: Just Another Kiwi My brakes would get very tight after a few minutes of stop and go driving. Then the brakes would start to drag. Turned out that my brake pedal push rod wasn't adjusted properly. The MC plunger was not returning fully to home position. Pressure would gradually build. Simple fix if that's the problem. __________________ My 65 C10 build: www.lugnutz65chevystepside.weebly.com Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild.

12-31-2015, 11:37 AM	#6
blown240 Registered User Join Date: Jan 2011 Location: CA Posts: 772	Re: Just Another Kiwi Yup! I had the same problem with mine. Adjusted the master push rod and all is well now. You will probably need to adjust your shoes after you adjust the pushrod... __________________ '61 Panel - Helms Bakery Truck - Daily Driver - FOR SALE

12-31-2015, 02:51 PM	#7
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi Stock standard M/C no booster, I will check the pushrod and adjust (if needed), thanks for the feed back I will keep you all posted. Thanks Robin.

12-31-2015, 10:13 PM	#8
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi How do I know how far to adjust the brake pedal push rod. Robin.

01-01-2016, 03:19 PM	#10
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi Yesterday afternoon I adjusted the pushrod 2/3mm off the plunger (gave me about 10mm freeboard at the pedal) did up the locknut and went about a ten km drive, by the time I got home the brake pedal was pretty well loaded up, I left it over night and I have just come in from testing the pedal this morning and it is now back to where it should be, something tells me it could be a M/C problem, any ideas anyone. Cheers Robin.

01-01-2016, 03:23 PM	#11
jtrichard Registered User Join Date: Jun 2013 Location: joshua tree ca. Posts: 1,484	Re: Just Another Kiwi sounds like a bad residue valve in the master .... time for rebuild

01-01-2016, 03:51 PM	#12
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi New M/C July 2015, looks like I may have to get the hands dirty and dive in there to see what's going on....Robin

01-01-2016, 11:29 PM	#13
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,778	Re: Just Another Kiwi If those rubber lines that go to the front weel cylinders and from the rear axle to the frame look old, replace them. They swell up internally.

01-11-2016, 03:36 PM	#14
Robin Smith Registered User Join Date: Jun 2015 Location: Levin 5570 New Zealand Posts: 24	Re: Just Another Kiwi I have replaced the front brake hoses when I did the M/C the rear one seems to be okay, I will keep an eye on it. I have readjusted the brake pedal push rod a Couple of times and I am pretty sure I have it where it seems to work properly now. Thanks to everyone for all your input, I think we can put a lid on this episode now. Cheers....... Robin.



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