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Old 02-24-2009, 11:11 AM   #1
americanmusc1e
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Tight Disc Brakes

I just finished putting disc brakes on my '70 pickup,
the truck has crossdrilled rotors (SUM-DSEP-5516L and SUM-DSEP-5516R from Summitracing) and stock calipers i bought the rotors and calipers slightly used off of e-bay and the brake pads came with them..........I put the calipers on there this morning and the pistons are all the way back in the calipers but the brakes are really tight, I put the wheel on it and i can barely turn it.........is this normal?????

thanks in advance
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Old 02-24-2009, 12:19 PM   #2
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Re: Tight Disc Brakes

did you use a tool or cclamp to make sure the pistons are all the way in ?
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Old 02-24-2009, 12:51 PM   #3
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Re: Tight Disc Brakes

sounds like you have the Rotors on way too tight then. If you remove the caliper is it still very hard to spin? I cant recall the torque spec for the spindle nut, but they are not much.
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Old 02-24-2009, 02:03 PM   #4
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Re: Tight Disc Brakes

I don't know what your setup is but I do recall there being a 1" rotor and a 1.25" rotor. I don't know if the calipers are any different but if they are, do you have the right calipers?
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Old 02-24-2009, 05:47 PM   #5
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Re: Tight Disc Brakes

Maybe before taking it back apart loosen the two nuts that hold the master cylinder to the booster or firewall. loosen them about half way. if the wheels will turn then your problem is that the rod in the booster is too long.

what happens if you open the bleeder screw on either wheel?
If the wheel becomes easier to turn, you have a hydraulic problem. possible collapsed hose??

If the wheel is still hard to turn, like someone else said it is at the wheel.
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Old 02-24-2009, 06:04 PM   #6
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Re: Tight Disc Brakes

Make sure the pins that the caliper rides on are not rusty inside the boots. I had it happen to me, they would slide a little, but not enough.
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Old 02-24-2009, 07:06 PM   #7
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Re: Tight Disc Brakes

You mentioned these are on your 70? What did the Spindles and disc setup come from? Since there is a difference from the 71 and 72, it would possibly help to diagnose your issue.

Speaking from the 72 spindles I just put together, I know, the calipers are the same. You said you bought these used, I would suggest making sure the cups are all the way in. If there is any corrosion on the cups it could be that they did not fully compress. I have seen some pretty funky cups that at first glance appeared fine on the outside. Beyond that, it is possible the pads are the wrong one's. also as mentioned be sure to spin the rotor with the caliper/pads out of the way to ensure is spins freely.
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Old 02-24-2009, 08:05 PM   #8
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Re: Tight Disc Brakes

Quote:
Originally Posted by cdowns View Post
did you use a tool or cclamp to make sure the pistons are all the way in ?
pistons are all the way in
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Old 02-24-2009, 08:06 PM   #9
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Re: Tight Disc Brakes

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Originally Posted by my67chevytruck View Post
sounds like you have the Rotors on way too tight then. If you remove the caliper is it still very hard to spin? I cant recall the torque spec for the spindle nut, but they are not much.
the rotors turn freely without the calipers on
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Old 02-24-2009, 08:14 PM   #10
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Re: Tight Disc Brakes

the pads on the outside are rubbing and the inside pads have a small gap between them, the spindles are McGaughy's stock height(http://store.summitracing.com/partde...5&autoview=sku) and they are conversion spindles designed for a 1970, the calipers i got off e-bay i think they are from a '72
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Old 02-24-2009, 08:53 PM   #11
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Re: Tight Disc Brakes

Well, that is odd, The caliper for C10s are the same from 71-78, so they should not be the culprit. Back to the pads maybe? Any chance to get some close up shots?

Anyone else have an idea?
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Old 02-24-2009, 09:15 PM   #12
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Re: Tight Disc Brakes

here's a pic, hope it helps


if you want a picture of something specific let me know
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Old 02-24-2009, 09:46 PM   #13
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Re: Tight Disc Brakes

hmmm, it looks correct. how bad is it rubbing?
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1967 C10 SWB FleetSide (under construction)
1969 K10 SWB FleetSide (Future Build)
1972 C10 SWB Stepside (Future Build)


56 chevy truck :
http://www.cardomain.com/ride/2955823/1

67 truck build:

http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1


69 k10:
http://67-72chevytrucks.com/vboard/s...d.php?t=389470
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Old 02-24-2009, 10:46 PM   #14
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Re: Tight Disc Brakes

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Originally Posted by my67chevytruck View Post
hmmm, it looks correct. how bad is it rubbing?
when i put the wheel on it i can barely turn it!!!!!!--it's tight
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Old 02-24-2009, 11:01 PM   #15
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Re: Tight Disc Brakes

I agree, it appears to be correct. Are the rotors freshly turned? if not do they have any ridges on them at all? It could be new pads + rough rotor surface equals stiff to turn by hand.

Did you try moving the truck under its own weight? and how did it feel.. Might be nothing to worry about one you get the brakes operating a few times. The caliper and pads will find their center. I say give it a drive and see how things go.

Let us know..
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Old 02-24-2009, 11:03 PM   #16
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Re: Tight Disc Brakes

Quote:
Originally Posted by Twisted78SS View Post
I agree, it appears to be correct. Are the rotors freshly turned? if not do they have any ridges on them at all? It could be new pads + rough rotor surface equals stiff to turn by hand.

Did you try moving the truck under its own weight? and how did it feel.. Might be nothing to worry about one you get the brakes operating a few times. The caliper and pads will find their center. I say give it a drive and see how things go.

Let us know..
will do tomorrow
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Old 02-25-2009, 12:58 AM   #17
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Re: Tight Disc Brakes

One other thing it could be. With the stock Prop valve the residual pressure in the lines for drum breaks is 10lbs where Disk breaks are only 2lbs. There are a couple ways of fixing this which I could elaborate on if need be. But if you changed the fronts to disk without changing the stock proportioning valve that was for a drum/drum set up, I would be looking there.
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Old 02-25-2009, 01:11 AM   #18
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Re: Tight Disc Brakes

So, looking at your picture, I circled in yellow the slider pin. Do you have the metal sleeve that goes on the pin and slide into the caliper (with the o-ring inside)?

Here is a hardware kit and you should have a large o-ring in the inside mounting hole and the small o-ring in the outside mouting hole, the sleeve on the slider pin and this all bolted to the spindle. It looks like you are missing parts.

Hardware kit (BTW, you should have four small, four large o-rings and four sleeves, the pic is missing a large o-ring)

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Old 02-25-2009, 09:57 PM   #19
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Re: Tight Disc Brakes

Quote:
Originally Posted by chevy_mike View Post
So, looking at your picture, I circled in yellow the slider pin. Do you have the metal sleeve that goes on the pin and slide into the caliper (with the o-ring inside)?

Here is a hardware kit and you should have a large o-ring in the inside mounting hole and the small o-ring in the outside mouting hole, the sleeve on the slider pin and this all bolted to the spindle. It looks like you are missing parts.

Hardware kit (BTW, you should have four small, four large o-rings and four sleeves, the pic is missing a large o-ring)

yeah i have all that stuff
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Old 02-25-2009, 10:06 PM   #20
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Re: Tight Disc Brakes

im still working on the truck, i'm trying to bleed the brakes but something isn't right, if i let the truck sit i have a good pedal feel but if i bleed the brakes and then try to push the pedal, it goes to the floor but if i let it sit a while it works normally again, also when i bleed the rear, just a little dribbles out(there is no pressure and it keeps on dribbling)--as far as i know, I have no air in the system--i think it might have something to do with the rear brake hose or the master cyinder, i'm picking both of those up tomorrow

any ideas--my daily driver has been down since Sunday i'm going crazy
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Old 02-27-2009, 02:52 PM   #21
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Re: Tight Disc Brakes

OK update, my brake warning light is on, and i am not getting hardly anything out of the rear bleeders, i'm pretty sure that the porportioning valve is stuck, but how do you reset it????????
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Old 02-27-2009, 03:18 PM   #22
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Re: Tight Disc Brakes

if its a stock type combination valve theres a pin tword the front of it sometimes covered by a rubber boot you take a cclamp and clamp it in the centered position while bleeding brakes//it sometimes can b reset by jumping on the brakes real hard but it will go off center again when tring to bleed brakes unless clamped in position
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Old 02-27-2009, 04:50 PM   #23
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Re: Tight Disc Brakes

Quote:
Originally Posted by cdowns View Post
if its a stock type combination valve theres a pin tword the front of it sometimes covered by a rubber boot you take a cclamp and clamp it in the centered position while bleeding brakes//it sometimes can b reset by jumping on the brakes real hard but it will go off center again when tring to bleed brakes unless clamped in position
Good point. One of my owners manuals, either the Chevelle or the truck shows a tool you can make that bolts to the combo valve and holds the button under the rubber boot depressed. I think it says to install this (or have somebody hold the button while you bleed which means you need yet another buddy to help you bleed the brakes).

Maybe grab a service manual and read up on bleeding brakes.
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Old 02-28-2009, 03:39 PM   #24
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Re: Tight Disc Brakes

I finally got my brakes fixed last night. I bled the lines by forcing fluid up from the bleeders and out the master cylinder with a large syringe, from now on that is the only way i am going to bleed brakes. after i got all the air out the brake warning light went off and the brakes worked normally(the rear bleeders had pressure again) I tested it out and it works great
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