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97 chevy 1500 brakes
#1110677 Mon Jun 29 2015 01:30 AM
Joined: Jan 2010
Posts: 4,605
D
DADS50 Offline OP
Shop Shark
My brother in law had a 97 silveraldo

he said last night he lost pedal pressure and brake light came on

he was low on fluid.

he came over today and asked it I could bleed his brakes.
I've never worked on that truck

Just got done bleeding all the brake lines, and he still has the issue with no brake pedal pressure.

passenger rear still had a few bubbles in the line and for some reason wouldn't clear.


anyone have experience with this model truck?
any pointers on what to look for next?
is there a common issue with this truck?

as he drives the warning light comes on with an I and P flashing. After a few pumps it goes away.

thanks

Re: 97 chevy 1500 brakes
DADS50 #1110679 Mon Jun 29 2015 01:36 AM
Joined: Mar 2010
Posts: 9,449
5
Master Gabster
Sounds like there is a leak somewhere. Need to look at every inch of all of the brake lines and anywhere there is a fitting. I usually start by spraying brake cleaner on everything, then pump the crap out of the brake pedal to force fluid to show up at the leaks.

Re: 97 chevy 1500 brakes
DADS50 #1110687 Mon Jun 29 2015 02:12 AM
Joined: Jan 2010
Posts: 4,605
D
DADS50 Offline OP
Shop Shark
I did see some wetness under the booster.
But he thought it was spillage of fluid from when he filled it the resoviour last night.

Ill have him look at all the fitting real good.

As we were bleeding I didn't notice any leakage but was not looking at all the joints.


Re: 97 chevy 1500 brakes
DADS50 #1110690 Mon Jun 29 2015 02:52 AM
Joined: Dec 2008
Posts: 963
5
Shop Shark
I've seen the brake lines rust out behind the gas tanks on those trucks. Check in that area. I see you're from Nevada, so I would think you wouldn't have any rust issues.


Brian
My 1955 Truck

My other 1955 Chevy

The older I get the more dangerous I am!!!!!
Re: 97 chevy 1500 brakes
DADS50 #1110771 Mon Jun 29 2015 04:16 PM
Joined: Jan 2007
Posts: 97
D
Shop Shark
I'm with 55Shaker. My 97 GMC rusted out the mainline to the rear.


1957 Chevy 3800 Panel Truck - "Nightmare"
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Re: 97 chevy 1500 brakes
DADS50 #1110811 Mon Jun 29 2015 08:26 PM
Joined: Jan 2010
Posts: 4,605
D
DADS50 Offline OP
Shop Shark
I thought it was odd I was not able to clear the right rear line when bleeding

The truck is a California truck, might be something in the right rear circuit

I passed on the information in the thread to him, thanks

It was over 100 degrees in my garage yesterday when we were bleeding the lines. Not fun.

Loking online last night it seem that truck is prone to low pedal pressure.

Thanks again for the suggestions



Re: 97 chevy 1500 brakes
DADS50 #1110839 Mon Jun 29 2015 10:54 PM
Joined: Apr 2005
Posts: 160
M
Shop Shark
If you can't find a leak anywhere, it's possible the master cylinder is leaking into the booster.

Had that problem on both an '05 & my '72.

I was losing fluid from the rear chamber of the master cylinder, but couldn't find a leak.

Asked a mechanic about it, he told me the fluid was more than likely
leaking into the booster, and then being sucked into the engine!

Had never thought of that.

Changing the master cylinder worked in both cases,
and gave me more pedal.
Just my 2 cents.
.

Re: 97 chevy 1500 brakes
DADS50 #1110842 Mon Jun 29 2015 11:13 PM
Joined: May 2006
Posts: 8,490
L
Master Gabster
Marc, I was thinking the same thing. Had a '96 Suburban in the shop a couple years ago with that very problem. Swapped out the master, bled out fine. However, the problem came back (not as bad) when it was driven, especially coming down from high speeds. Turned out the booster had failed as well.
I would suggest, if you change out the master, put a new booster in at the same time. It's not that much more work to do, worst part is getting the clip back on the brake light switch.


Bill Burmeister
Re: 97 chevy 1500 brakes
DADS50 #1110847 Mon Jun 29 2015 11:51 PM
Joined: Jan 2010
Posts: 4,605
D
DADS50 Offline OP
Shop Shark

As mentioned earlier I saw wetness at the bottom of the booster, but didn t know how to diagnose a booster problem.

The pedal traveled lower when the engine was on

Removed the vac line on the booster and had good vac on that line.

Ill pass this info on

I did look at a video las night on disconnecting the pedal. Did not look like fun

Thanks for the info

Re: 97 chevy 1500 brakes
DADS50 #1110896 Tue Jun 30 2015 03:38 AM
Joined: Mar 2010
Posts: 9,449
5
Master Gabster
When the rear seal of the master cylinder fails, you will see fluid where it mates to the booster and invariably inside of the booster, as it is sucked in by vacuum. Found that out the hard way on a 1966 Brurk (common pronunciation round chere) Special Deluxe. Thank God for emergency brakes!
Carl

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