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#1 |
Registered User
Join Date: May 2009
Location: Hazel Green AL
Posts: 286
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What causes brake fluid to move from rear to front reservoir?
I have a 67 C-10 that i just bought that has a brake problem.The pedal is soft and it travels a long way untill you get brakes.It has drums all the way around and a power booster.I removed cover on master cylinder a week ago and the back reservoir was dry.It goes to rear brakes right? I replaced the 2 front hoses going to the front brake wheel cylinders, bled brakes all the around and refilled master cylinder. I took the drums off and inspected brakes and parts and every thing looks new and correct.When i took the cover off of the master cylinder yesterday the back reservoir was dry again and alot of fluid ran out of the front reservoir.It has no visible brake fluid leaks to cause the back reservoir of the master cylinder to be dry.What could be causing this?
Last edited by 72farmer; 06-20-2010 at 08:59 AM. |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: What causes brake fluid to move from rear to front reservoir?
i'd think bad master cylinder if you can find no leaks // would check the whole length of the brake lines real good for rotted out spot where it leaks first tho
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: What causes brake fluid to move from rear to front reservoir?
you have a bad seal on the plunger assembly
You can go old school and replace just the seals and rebuild the MC yourself or its time for a new MC from the local autoparts store Good time to flush the entire system to insure that you get any small debris out of the system This failure normally occurs from wear and use or foreign objects in the brake fluid
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1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles ![]() 18.5" x 31" Hoosier Pro Street Radials ![]() ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree ![]() |
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#4 |
Active Member
![]() Join Date: Dec 2004
Location: Marysville, OH
Posts: 667
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Re: What causes brake fluid to move from rear to front reservoir?
If you need to get a master cylinder, save yourself a lot of hassle and get a new one, not a rebuilt/remanufactured one. The last time I did a master cylinder I went through three or four remanufactured ones from NAPA that all leaked. Luckily they leaked when I was bench-bleeding them so I didn't get into a lot of work installing and removing them. Took the last one back and got a brand new one - worked like a champ. It costs about twice as much, but its worth it to avoid this problem. I've had it happen on two different vehicles.
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1957 GMC Ambulance 1962 Belair Wagon 1963 C80 Truck Cab *FOR SALE* 1969 Chevy C10 Short Bed 1972 Chevy C10 Long Bed *SOLD* 1996 C3500 Dually *SOLD* |
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#5 | |
Registered User
Join Date: Aug 2005
Location: Pasadena,Tx /Pto Pta DR
Posts: 5,415
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Re: What causes brake fluid to move from rear to front reservoir?
Quote:
Good advice. IMO its not worth it either. |
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#6 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: What causes brake fluid to move from rear to front reservoir?
For the price just go get a master cyl, reman cost me $17, so new is probably about $35.
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#7 |
Registered User
Join Date: Jul 2015
Location: smyrna georgia
Posts: 54
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Re: What causes brake fluid to move from rear to front reservoir?
I know this is an old thread but, I'm having these issues as well. I put all new brake parts on front to back. Disc on front, all new lines, new MC, new Prop. valve, new rear drums parts, new booster. I read this thread a few weeks ago and replaced my already new master cylinder with a new one. I'm having the same issues. Back reservoir fluid moving to the front reservoir. 2 new MC's and still the same result. Can it be the prop valve? TIA
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#8 |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: What causes brake fluid to move from rear to front reservoir?
I went with a cheap reman about 10 years ago, kept blowing through Power Boosters about 6 years into it. The Power Boosters were a lifetime warranty so I got 3 replacements.
Finally put a decent MC on there last year and no more problems. The MC would do the same thing as the OP and excess fluid would go into the MC eventually bringing it to ruin also. Lifetime Warranty products are worth it. Just got a new power steering gear box that lasted 10 years and new alternator. |
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#9 | |
Registered User
Join Date: Jul 2015
Location: smyrna georgia
Posts: 54
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Re: What causes brake fluid to move from rear to front reservoir?
Quote:
I bought the booster, MC, PV, all as a kit. Of course it was out of warranty by the time it went bad or I had know it went bad. And I contacted the company I bought it from and they told me to replace it with a 78 Corvette MC. Becuase that is what the set up was for. When I got one from the auto parts store it was exactly like the one I had minus, the plunger in the new MC was recessed. So, I had to make a 1" spacer for inside the new one. There wansnt anymore adjustment from the rod. Now I'm not sure which MC to buy unless I see it first. What model did you buy a MC set up for? Thanks for the reply! |
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#10 | |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,332
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Re: What causes brake fluid to move from rear to front reservoir?
Quote:
The master cyl is bad!!! Get a NEW one, not a reman!!! |
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#11 |
Registered User
Join Date: Jul 2015
Location: smyrna georgia
Posts: 54
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Re: What causes brake fluid to move from rear to front reservoir?
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