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dsalinas1939
Top Member
USA
1325 Posts |
 Posted - 04/30/2012 : 11:56:28 AM
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| ok guys i have this 99 bus international amtran body its has a very intermitten brake pressure light and audible that comes on i been driven it for days and nothing but soon as i put it back on road driver complains light is on again they bring it in i go out there start ity up and nothing i was told that the o it has hydraulic brakes i was told the brake modules are very comin to go bad on them and the switch on master i changed both and still having problem the brake paddle never feels bad and bus always stops good so i am sure its an electrical glitch anyone run into this before????? |
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willism
Advanced Member
United States
250 Posts |
Posted - 04/30/2012 : 12:18:34 PM
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| Thats pretty common we usually change the relay off the booster and brake light switch together normally fixes it. |
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Thomasbus24
Administrator
USA
4547 Posts |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 04/30/2012 : 12:51:43 PM
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| sry bout the repeat question thanks for the info |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 04/30/2012 : 1:02:12 PM
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| Boy, that made me sound like a jerk (which I am), but I didn't mean it that way! Sorry. |
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Bassman
Top Member
USA
558 Posts |
Posted - 05/01/2012 : 03:57:36 AM
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| Do yourself a favor and fix all the taillight grounds (or change the units) and change all the taillight bulbs and 9 times out of 10, the problem will go away.When the tailight ground goes bad or the filament in the bulb shorts, it feeds tailight voltage back up the brakelight wire and fools the module into thinking that the brakelights are on without sensing power going to the booster and that triggers your light. |
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Fastback
Top Member
1500 Posts |
Posted - 05/01/2012 : 06:05:04 AM
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| Also make sure hose clamps are snug on suction side of power steering pump. |
Why yes, the ORIGinal CHARGER is a Fastback |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/03/2012 : 11:30:46 AM
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| i replaced all the rear tail lights cleaned all grounds so far no complaints thanks again guys |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 05/17/2012 : 11:33:52 AM
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| Has anyone ever used this system on a pickup. I thought it might be cool on my old 72 Ford. I would probably have to get a P/S pump off a truck with hydroboost though. |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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tigger2
Advanced Member
USA
470 Posts |
Posted - 05/18/2012 : 06:31:28 AM
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| WolfOr try www.millsupply.com or www.stepvanparts.com they have a section on p/s pumps, resivoirs, hydro boosts, and master cylinders. to fit quite a few applications. |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/18/2012 : 06:34:27 AM
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| thought i had it fixed but the light is back on again all rear tail lights replaced all grounds cleanod and repaired it lasted a few days but that wasnt the problem |
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Fastback
Top Member
1500 Posts |
Posted - 05/18/2012 : 06:54:48 AM
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| If you havnt replaced the brakelight switch, the relay on the booster and checked the hose clamps on the suction side of the ps pump for tightness, I would do it now. |
Why yes, the ORIGinal CHARGER is a Fastback |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 05/18/2012 : 07:18:34 AM
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quote:
Originally posted by tigger2
WolfOr try www.millsupply.com or www.stepvanparts.com they have a section on p/s pumps, resivoirs, hydro boosts, and master cylinders. to fit quite a few applications.
Super links, thanks man. |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/18/2012 : 07:53:27 AM
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| i checked the hoses and tightened clamps brake light switch is new didnt replace relay tho |
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Bassman
Top Member
USA
558 Posts |
Posted - 05/18/2012 : 07:54:24 AM
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| After you do the relay on the side of the MC, there is also an brake monitor module about the size of a credit card under the dash above the brake pedal. It is not usually the culprit, but if you have another IH product, you may want to swap it to see. The later model modules were black and were less sensitive to this issue. |
Edited by - Bassman on 05/18/2012 07:55:25 AM |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/18/2012 : 08:11:39 AM
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| yeah that was first thing i did was swap that module i had another bus with same problem i swapped it out and it fixed problem but it didnt fix this bus thanks for info gonna swap out the relay and see what happens |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 05/18/2012 : 08:14:15 AM
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| Make sure the module hasn't gotten wet and corroded the PCB. |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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Troy87
Senior Member
United States
52 Posts |
Posted - 05/21/2012 : 1:59:50 PM
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| Sounds similar to a problem I had, found driver was one of those who used both feet to drive and was 'riding' brake from time to time. If driver is touching pedal, causing it to bounce slightly, the pedal switch would set off alarm. This would explain why it works ok for you, you probably dont ride brake. |
Edited by - Troy87 on 05/21/2012 2:04:27 PM |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/21/2012 : 5:22:43 PM
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| i found now if i just sit in parking lot bus in gear and foot on brake hold brake for about fifteen seconds the light and alarm will come on everytime the i swapped modules from another bus and still problem is there now i am wondering if it is a hydraulic problem there are no leaks and aall clamps are tught |
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Bassman
Top Member
USA
558 Posts |
Posted - 05/22/2012 : 03:40:52 AM
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| Look at brake light switch and connections next. Swap if necessary. |
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tigger2
Advanced Member
USA
470 Posts |
Posted - 05/22/2012 : 05:30:54 AM
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| To set the brake light switches use two test lights in the open w/ brakes released terminals and adjust the two switches until both lights light at the exact same time. Somthing about not being sycronous sets of the alarm. Be careful tightening the jam nuts and recheck after tightening them. |
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Troy87
Senior Member
United States
52 Posts |
Posted - 05/22/2012 : 07:03:20 AM
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| You can also replace the 'dual switches' with a single switch. We have done alot of them. Brake Switch bracket p/n: 3521483C2...Wiring Harness p/n: 2038971C91...Brake Switch p/n: 3522366C92. Easy installation fits into existing holes on dash. |
Edited by - Troy87 on 05/23/2012 09:34:30 AM |
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Fastback
Top Member
1500 Posts |
Posted - 05/22/2012 : 08:26:07 AM
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| I believe a 99 could very well be oem equipped with the single switch |
Why yes, the ORIGinal CHARGER is a Fastback |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 05/22/2012 : 09:00:26 AM
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| That pedal switch rings a bell. Had a 99 4700 going nuts and driving me nuts with it. It was in fact that single switch...only thing I could figure is that one of the internal contacts was closing just slightly faster than the other. New switch straightened the thing right out! |
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Troy87
Senior Member
United States
52 Posts |
Posted - 05/22/2012 : 1:10:36 PM
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| Exactly Thomas....Those switches are plastic, they do wear out. The switch is still two switches, just in one housing. They are adjustable, but that is usually a temp fix. replacement is the way to go. |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/24/2012 : 09:23:13 AM
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| this bus has only one brake switch gonna swap out this bus is a spare so i been workin on it when i have tine but will let no if the switch swap works but again it only has one switch |
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dsalinas1939
Top Member
USA
1325 Posts |
Posted - 05/24/2012 : 12:28:11 PM
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| i just started takin switch out when i took the plugs off i see corrosion on the pins so i am just gonna order a new one not gonna mess around and swap it |
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Topic |
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99 IH internation bus brake pressure light
