What have you done to your square lately??

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Normmus

Normmus

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Location
Saskatchewan
First Name
Norm
Truck Year
1977
Truck Model
K10
Engine Size
350
I drove the 77 K10 for the first time this year. Needed to pick something up in the city. Part way through the drive the brake warning light came on so I pulled over and popped the master cylinder cap off. The rear most reservoir is empty. Was able to accomplish the mission but now have a problem to diagnose. I still have brakes but stopping power is reduced.
 
WFarm

WFarm

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Central Virginia
First Name
Paul
Truck Year
1975
Truck Model
K5 Blazer
Engine Size
454
Drove it. Filled it up and drove to nearby town, about 1/2 a tank away (15 miles). Just kiddin of course.

Beautiful day for a drive.

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Tank6x2

Tank6x2

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Edmonton Alberta Canada
First Name
Kurt
Truck Year
79/86
Truck Model
C30
Engine Size
350, TH400.4:10 gears 2WD
Spent the last couple of weekends Attempting to stay focused on just the firewall- cutting it apart, fabricating the brake support plate, modifying the new driver side firewall but after painting the interior of the rain tray today started preparing for the roof skin removal, popping out and busting spot welds along the seam of the door trims.
 

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Tank6x2

Tank6x2

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Edmonton Alberta Canada
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Kurt
Truck Year
79/86
Truck Model
C30
Engine Size
350, TH400.4:10 gears 2WD
Normmus said:
I drove the 77 K10 for the first time this year. Needed to pick something up in the city. Part way through the drive the brake warning light came on so I pulled over and popped the master cylinder cap off. The rear most reservoir is empty. Was able to accomplish the mission but now have a problem to diagnose. I still have brakes but stopping power is reduced.
Click to expand...
Kinda sounds like the master needs a reseal/ rebuild, hydro boost or vacuum boost?
 
DoubleDingo

DoubleDingo

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Right where I am
First Name
Bagoomba
Truck Year
1981
Truck Model
81-C20 Silverado Camper Special-TH400-4.10s
Engine Size
Carb'ed Vortec 350
JamesSam said:
Drove it a bit today: grocery run, kids wanted McDowells for lunch. Took my daughter to a friend's house and picked her up. In between places i put a half bottle of Lucas Transmission fix in. It is shifting in to 2nd gear a bit hard sometimes. I noticed a little difference after and it felt like it was smoothing out. More cruising around tomorrow afternoon for errands and such. Maybe the other half of the bottle goes in, we'll see.
Click to expand...
Wonder if it's shifting different because it's getting more vacuum?
 
Grit dog

Grit dog

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Auburn, Washington
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Todd
Truck Year
1986, 1977
Truck Model
K20, C10
Engine Size
454, 350
Normmus said:
I drove the 77 K10 for the first time this year. Needed to pick something up in the city. Part way through the drive the brake warning light came on so I pulled over and popped the master cylinder cap off. The rear most reservoir is empty. Was able to accomplish the mission but now have a problem to diagnose. I still have brakes but stopping power is reduced.
Click to expand...
Look for the wet spot.
 
H

HotWheelsBurban

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Houston, Texas
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Carol
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1990
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R2500 Suburban
Engine Size
350
Tank6x2 said:
Kinda sounds like the master needs a reseal/ rebuild, hydro boost or vacuum boost?
Click to expand...
Or leaking rear wheel cylinder/cylinders. Had that happen to my truck. If you leave it unfixed long enough the shoes will get contaminated linings and the brakes will grab.
If the backing plate shows signs of dampness this is likely the issue.
 
Tank6x2

Tank6x2

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Kurt
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C30
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350, TH400.4:10 gears 2WD
HotWheelsBurban said:
Or leaking rear wheel cylinder/cylinders. Had that happen to my truck. If you leave it unfixed long enough the shoes will get contaminated linings and the brakes will grab.
If the backing plate shows signs of dampness this is likely the issue.
Click to expand...
Best part of ripping and tearing- gotta find it to fix it
 
Sgt Gus

Sgt Gus

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Texas
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Mark
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87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
WFarm said:
Drove it. Filled it up and drove to nearby town, about 1/2 a tank away (15 miles). Just kiddin of course.

Beautiful day for a drive.

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Click to expand...
What gauges are in there? Do you have in a build page? Sweet...
 
JamesSam

JamesSam

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VA
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Sam
Truck Year
1987
Truck Model
Silverado V10
Engine Size
5.7 L 350 v8
JamesSam said:
Good questuon It is happening right after the fix. I am thinking it is related somehow myself.
Click to expand...
Would the 700R4 change gears at different RPM with intake bolts tightened? Would it be possible to over torque intake bolts? Or am I way off here?
 
bucket

bucket

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Andy
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'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
JamesSam said:
Would the 700R4 change gears at different RPM with intake bolts tightened? Would it be possible to over torque intake bolts? Or am I way off here?
Click to expand...

Two things come to mind. Either your vacuum leak was bad enough that it affected your throttle position in relation to rpm (your trans uses rpm and throttle angle to determine shift points) or they moved the throttle bracket when tightening your intake bolts and then re-adjusted your T.V. cable.
 
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