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#1 |
Registered User
Join Date: Sep 2017
Location: Austin, TX
Posts: 31
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K30 / K5 Frankenstein: braking problem
My braking is super touchy right now because the back drums are braking way before the front discs. Turns out I have a master cylinder, proportioning valve, and front lines for a K5, but the axles have been swapped out (owner before me) to 1 tons, which I’m guessing are from a K30.
So looks like I need to go find an MC, prop valve, and line dimensions off a K30 to match the bigger axels, right? Anyone have any advice? Or done this before and been through challenges they can share? Any help is appreciated! |
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#2 |
Registered User
Join Date: Mar 2020
Location: Lakeside, AZ
Posts: 45
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Re: K30 / K5 Frankenstein: braking problem
You may just have a bad prop valve or air in the system. When I put tons on my K5 I didn't have to do anything but it was built into a crawler and not driven on the road much. An adjustable prop valve would probably be what I would do if I was going to be driving on the street.
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#3 |
Registered User
Join Date: Sep 2017
Location: Austin, TX
Posts: 31
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Re: K30 / K5 Frankenstein: braking problem
Yeah that’s what this one is built into (457s in the front and rear and fully rhino lined haha). Great on the trail but hell on the street, and I’ve been trying to make it more of a driver lately.
That’s a good idea, I can start there and keep doing trial and error. Any in particular that you’d recommend? |
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#4 |
Registered User
Join Date: Mar 2020
Location: Lakeside, AZ
Posts: 45
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Re: K30 / K5 Frankenstein: braking problem
I would get the best you can afford.
You got a pic of your rig on here? |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,615
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Re: K30 / K5 Frankenstein: braking problem
You could plumb one of these into the rear line. Put it close to the master.
https://www.summitracing.com/parts/w...hoCyywQAvD_BwE |
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#6 |
SWB 4x4 Collector
![]() Join Date: Jun 2001
Location: Osage City, KS
Posts: 5,152
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Re: K30 / K5 Frankenstein: braking problem
Could always run hyrdroboost.
__________________
TREVOR ![]() ![]() ![]() ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=624819 ![]() ![]() :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever |
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#7 |
All about them K’s
![]() Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,375
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Re: K30 / K5 Frankenstein: braking problem
I agree. That and the hydraulic clutch are the two best things I’ve done to my K20. It’s really not hard to do.
__________________
Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 ![]() |
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#8 |
Page intentionally left blank.
![]() Join Date: Jul 2006
Location: Laramie, WY
Posts: 299
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Re: K30 / K5 Frankenstein: braking problem
My guess, and only because I’ve been researching as part of a swap I did, is you have the wrong proportioning valve ( and maybe MC). Was it originally a four wheel drum vehicle? Disc drum needs a different PV from that, and MC should have a front chamber (disc) that’s larger than the rear (drum).
__________________
There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.There is another theory which states that this has already happened. - Douglas Adams '67 GMC 4x4, 305 V6! Or all the parts for anyway... '17 Subaru Outback. '18 Toyota Tacoma TRD Off Road. '99 Ducati 900SS. |
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Tags |
blazer, brake conversion problem, brake fluid capacity, brake help, k30 |
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