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04-07-2020, 07:29 PM
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#1 |
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Registered User
Join Date: Jun 2018
Location: Sacramento
Posts: 72
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Rear drums locking easy after Power Disc conversion
Just finished up doing the power disc conversion on my c10 from the original manual drums. Brakes before stopped ok under 40mph but were pretty terrifying from anything above that. No locking issues.
After the swap the rears would lock up under any sudden application of pressure. Went round robin on bleeding, checking everything. Improved after the fronts bed in some but only a little. Ended up checking the rears and they were adjusted way too tight. Lug nuts were noticeably hot after a short trip. Backed the adjuster (and hand brake off) and it's better. It doesn't lock if you increase the pressure gradually (normal braking) but under a sudden application it still locks the rears easily. When I had the rear drums off the rear pads were looking a little thin so it's probably time to build them anyways. There was no fluid or grease inside the drums. Truck has 240k and while always maintained well, it probably only put 500 miles in the last five years on before I ended up with it. For those who have done the power conversion, is the locking normal? Seems to me this is locking in an unsafe manner. The proportioning valve is marked PV2 (which should be correct) but don't know which end I'm chasing an issue here on.
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64 C10 A bunch of Volvos Luthier Simpsons Nerd 
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04-07-2020, 07:54 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: Rear drums locking easy after Power Disc conversion
You got a pic of your prop valve?
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04-07-2020, 08:10 PM
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#3 |
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But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: Rear drums locking easy after Power Disc conversion
I used one of these. That way I can adjust the rears depending on the load I have in the bed.
https://www.summitracing.com/parts/s...AaAmZUEALw_wcB
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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04-07-2020, 09:11 PM
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#4 |
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Registered User
 
Join Date: Oct 2006
Location: San Jose NOR*CAL
Posts: 3,080
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Re: Rear drums locking easy after Power Disc conversion
Proportioning Valve.... as mentioned what are you using?
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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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04-07-2020, 09:51 PM
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#5 | |
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Registered User
Join Date: Jun 2018
Location: Sacramento
Posts: 72
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Re: Rear drums locking easy after Power Disc conversion
Quote:
It’s this kit (but with captain fabs bracket) https://azproperformance.com/product...ssembly-700200
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64 C10 A bunch of Volvos Luthier Simpsons Nerd
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04-07-2020, 10:11 PM
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#6 |
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60-66 Nut
 Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Rear drums locking easy after Power Disc conversion
Did you get good fluid flow when bleeding the front?
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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04-08-2020, 01:24 AM
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#7 | |
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Registered User
Join Date: Jun 2018
Location: Sacramento
Posts: 72
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Re: Rear drums locking easy after Power Disc conversion
Quote:
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64 C10 A bunch of Volvos Luthier Simpsons Nerd
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04-08-2020, 09:30 PM
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#8 | |
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60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Rear drums locking easy after Power Disc conversion
I can't say why your rears are locking up before the front, but you might just have to plumb in an adjustable valve in the rear line. Then you can adjust to get the brake bias you are wanting.
Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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04-08-2020, 02:38 AM
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#9 |
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Registered User
Join Date: Nov 2018
Location: South San Francisco CA,
Posts: 441
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Re: Rear drums locking easy after Power Disc conversion
I was thinking proportioning valve as well. Isn't there something about the lines being the same length on the front and backs? That is why the fronts are usually in a circle by the master cylinder? I am just trying to remember, but I am sure the pro's here will get you going. I just seem to remember something about the lines having to be equal so the pressure is the same. RR
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