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Username Post: Low speed brake lock        (Topic#359788)
djackson210 
Poster
Posts: 69

Age: 36
Loc: San Antonio, Texas
Reg: 01-31-19
02-12-20 07:21 AM - Post#2786354    

'00 C2500 CCSWB 2WD

The other day I noticed my brakes seems to "lock up" when pulling into a parking spot at low speed. Best I can tell it only does it going forward, I haven't been able to replicate it going backwards.

I spent about 45 minutes doing some reading on the topic before posting here, but I couldn't seem to find any sort of consistent answer. So I'm posting here in the hopes that some of you fine folks might have some clear cut pointers for me.

The truck has over 300K miles on it, so anything is up for grabs at this point. I bought the truck a few months back & the only thing I've done regarding the brakes is put a new drivers side rotor on it.

The problem just appeared less than a week ago.

Any and all pointers are greatly appreciated, thanks!

'91 Chevy C1500 SC LWB
'00 Chevy C2500 CC SWB


Edited by djackson210 on 02-12-20 07:22 AM. Reason for edit: No reason given.

 
bobb 
Super Senior Member
Posts: 5530

Loc: paradise
Reg: 09-05-03
02-14-20 07:16 AM - Post#2786477    
    In response to djackson210

seem to? lock up or drag? front or rear?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 885
stumppuller
Loc: Canada
Reg: 11-01-04
02-14-20 08:37 PM - Post#2786541    
    In response to djackson210

  • djackson210 Said:
the only thing I've done regarding the brakes is put a new drivers side rotor on it.



This is a bit of a red flag to me. What was wrong with that rotor?

To add to the above posts questions, are we talking 4 wheel disc, or disc front/drum rear?


-91 Sierra C2500, now K2500
-81 Chev K20


 
djackson210 
Poster
Posts: 69

Age: 36
Loc: San Antonio, Texas
Reg: 01-31-19
02-16-20 07:18 AM - Post#2786631    
    In response to bobb

  • bobb Said:
seem to? lock up or drag? front or rear?



Poor wording on my part, apologies. It doesn't "seem to" it actually does it. Not so much a lock up type deal, it reacts as if I've pressed down quickly & firmly on the brakes even though I'm just applying steady pressure to the pedal when rolling into a parking spot or any other low speed slow down application. I can "feather" the pedal & avoid it from happening. But if I just apply normal pedal pressure it'll do it 75-80% of the time. Quite the interesting problem.

Best I can tell it feels like the front brakes, but it could be the back. I'm not 100% certain.


  • stumppuller Said:
This is a bit of a red flag to me. What was wrong with that rotor?

The front drivers side rotor was severely gouged. Like the previous owner ran the pad down to bare metal & then just kept on driving the truck with the brake pad gone. No idea why it only happened on the drivers side though.

To add to the above posts questions, are we talking 4 wheel disc, or disc front/drum rear?

The truck has front disc & rear drums.




'91 Chevy C1500 SC LWB
'00 Chevy C2500 CC SWB


 
Sabino 
Member
Posts: 120

Reg: 07-16-05
02-16-20 08:08 AM - Post#2786636    
    In response to djackson210

I would recommend replacing both rotors whenever you need to replace one. Old rotors are thinner than the new and usually have runout/some warping that new won’t, friction on pads probably better on new rotor also.
Also, if looking at brakes and one side is worn much more than other, there is something causing that - like a stuck caliper, etc.

Theoretically it should be ok to have rotors of different thicknesses but it seems asking for problems.

65 Belair 350
68 Camaro 327
93 Suburban 5.7L TBI


Edited by Sabino on 02-16-20 11:42 AM. Reason for edit: No reason given.

 
someotherguy 
Senior Moderator
Posts: 29066
someotherguy
Age: 49
Loc: Texas
Reg: 08-01-03
02-17-20 07:42 AM - Post#2786715    
    In response to djackson210

Most likely the front, and most likely due to the flex hoses going bad internally. Replace in pairs.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
djackson210 
Poster
Posts: 69

Age: 36
Loc: San Antonio, Texas
Reg: 01-31-19
02-17-20 09:08 AM - Post#2786719    
    In response to someotherguy

Much obliged folks. I'm going to do both tips so far. 2 matching rotors and some new flex lines.

I'll report back after these 2 items are done to see if I have any success. Thanks!

'91 Chevy C1500 SC LWB
'00 Chevy C2500 CC SWB


 
stumppuller 
"9th Year" Gold Supporting Member
Posts: 885
stumppuller
Loc: Canada
Reg: 11-01-04
02-17-20 03:28 PM - Post#2786750    
    In response to djackson210

Just to add to the above, be sure the sliders are free and well lubed, and roll the caliper piston boot back to check for any rust around the piston.

My money is on the RH caliper piston being seized. It will cause all the pressure/fluid volume to travel to the left, causing excessive wear and grabbing.

Most likely the previous owned forced the old pistons back in, tossed in some new pads and sold it. As with rotors and hoses, always replace calipers in pairs.

-91 Sierra C2500, now K2500
-81 Chev K20


 
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