99 Bravada brake pedal pushes up

jigginpig · 11-25-2006, 08:17 PM

my 1999 olds Bravada started making a humming noise and pushing back on the brake pedal when the brakes are depressed. I put on new pads and checked for frozen calipers found none could this be the booster? Please help
jigginpig

**Midnight Tech** · 11-26-2006, 10:24 AM

Do you have an "ABS" light on and is the pedal pulsating when it pushes back? Either one of these points to something amiss in the antilock system. Get your mechanic or parts store to pull codes on it ASAP...thinking you have ABS and it not working is a bad thing.

jigginpig · 11-28-2006, 11:32 AM

M T
I pulled codes myself I have a snapon scanner,and pulled the abs codes the light never came on and no codes present so I cleared out any way last night the abs light blinked 3-4 times then stayed on solid so naturally i thought it set codes .While the abs light was on it did fine then in a while it off and the problem started all over again .Seems as though I can here a motor running is that hydrovac? I just don't understand these brakes it has a Kelsey Hayes box up near the master cylinder the only time I've seen this is on 1-ton or bigger trucks with hydromatic over hydraulic brakes. Puzzled Please help
jigginpig

**Midnight Tech** · 11-28-2006, 03:10 PM

JP, can you get a pic of that unit and post it?

jigginpig · 11-30-2006, 08:13 AM

trying to locate the abs switch can you help? abs light goes off and brakes work fine, light comes on and brakes act up, the humming comes back and the pedal pulsates when mashed. I am getting no codes but it acts like the abs switch need to the location of the switch A.S.P. very puzzled please help

dai · 11-30-2006, 08:36 AM

before all the fancy stuff came in when brakes were just brakes,for pulsating the first thing we would check for is a buckled disk

11-25-2006, 08:17 PM	#1 (permalink)
jigginpig Registered User Join Date: Nov 2006 Posts: 3 OS: xp	99 Bravada brake pedal pushes up my 1999 olds Bravada started making a humming noise and pushing back on the brake pedal when the brakes are depressed. I put on new pads and checked for frozen calipers found none could this be the booster? Please help jigginpig

11-26-2006, 10:24 AM	#2 (permalink)
Midnight Tech Admin/Head GreaseMonkey/Igor's alter ego/Grand Exalted PoohBah Join Date: Dec 2001 Location: SC Posts: 2,924 OS: Windows XP Home/Pro SP3/Windows 98SE/Fedora Core 6/RH 7.2 with Autopoint/TAMS II	Do you have an "ABS" light on and is the pedal pulsating when it pushes back? Either one of these points to something amiss in the antilock system. Get your mechanic or parts store to pull codes on it ASAP...thinking you have ABS and it not working is a bad thing. __________________ Please post all questions in the appropriate forum. Questions sent by email or PM will not be answered. Sharing my life...with my Imzadi! Interested in Trek gaming? Check out the Dynaverse! Proud supporter of the Carolinas Aviation Museum. If we have helped you in any way, please donate to keep TSF up and running!

11-28-2006, 03:10 PM	#4 (permalink)
Midnight Tech Admin/Head GreaseMonkey/Igor's alter ego/Grand Exalted PoohBah Join Date: Dec 2001 Location: SC Posts: 2,924 OS: Windows XP Home/Pro SP3/Windows 98SE/Fedora Core 6/RH 7.2 with Autopoint/TAMS II	JP, can you get a pic of that unit and post it? __________________ Please post all questions in the appropriate forum. Questions sent by email or PM will not be answered. Sharing my life...with my Imzadi! Interested in Trek gaming? Check out the Dynaverse! Proud supporter of the Carolinas Aviation Museum. If we have helped you in any way, please donate to keep TSF up and running!

11-30-2006, 08:13 AM	#5 (permalink)
jigginpig Registered User Join Date: Nov 2006 Posts: 3 OS: xp	trying to locate the abs switch can you help? abs light goes off and brakes work fine, light comes on and brakes act up, the humming comes back and the pedal pulsates when mashed. I am getting no codes but it acts like the abs switch need to the location of the switch A.S.P. very puzzled please help Last edited by jigginpig; 11-30-2006 at 08:17 AM.

11-30-2006, 08:36 AM	#6 (permalink)
dai Manager, Hardware Forums Join Date: Jul 2004 Location: west australia Posts: 56,670 OS: win 7 32x 64x rtm	before all the fancy stuff came in when brakes were just brakes,for pulsating the first thing we would check for is a buckled disk __________________

11-28-2006, 11:32 AM	#3 (permalink)
jigginpig Registered User Join Date: Nov 2006 Posts: 3 OS: xp	M T I pulled codes myself I have a snapon scanner,and pulled the abs codes the light never came on and no codes present so I cleared out any way last night the abs light blinked 3-4 times then stayed on solid so naturally i thought it set codes .While the abs light was on it did fine then in a while it off and the problem started all over again .Seems as though I can here a motor running is that hydrovac? I just don't understand these brakes it has a Kelsey Hayes box up near the master cylinder the only time I've seen this is on 1-ton or bigger trucks with hydromatic over hydraulic brakes. Puzzled Please help jigginpig