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'87 SR5 Turbo Automatic has Really Soft Brakes

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Old 06-16-2018, 08:19 AM
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Idle speed is very important also, if your idle is too high with an automatic tranny it will be trying pretty hard to keep pushing you. The trans doesn't do anything different when you push the brakes, only when you let off the throttle.
You could try shifting to neutral and see how much difference there is in braking.
Old 06-16-2018, 09:02 AM
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Front Brakes:

Last edited by Charles4x4; 06-16-2018 at 09:04 AM.
Old 06-16-2018, 09:05 AM
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Anyone know where to source a new top to this lugnut or a new lugnut to match?
Old 06-16-2018, 09:09 AM
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good, you have even pad wear. but the pictures don't answer any questions.
Do you have any vacuum leaks?
Are your rear brakes adjusted correctly?
Is the pedal spongy?
What is your engine RPM at Idle?
Old 06-16-2018, 10:11 AM
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Rear Brakes. The rear passenger felt a bit seized so I lubticated it. Rear drivers felt fine. I don’t know much about drum brakes, so i’m about to look up how to adjust them (e brake cable method?).

i can pull the brake cable and it moves he gear and grabs new teeth each time. Now I just have to learn what that does and when it is adjusted right.

Drivers:


Old 06-16-2018, 10:12 AM
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Rear passenger after I cleaned it a bit.

Old 06-16-2018, 10:17 AM
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Originally Posted by akwheeler
good, you have even pad wear. but the pictures don't answer any questions.
Do you have any vacuum leaks?
Are your rear brakes adjusted correctly?
Is the pedal spongy?
What is your engine RPM at Idle?
- No vacuum leaks that I know of.
- Rear brakes are probably not adjusted but I need to read about this more as i’m Clueless on drum brakes
- Pedal is a bit spongy but I haven’t checked to see if air in the lines yet. That is next.
- RPM at Idle in P = 1,000-1,100
- RPM in Gear = (will fill in later since it’s ok jack stands right now)
Old 06-16-2018, 10:47 AM
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idle is too high. 650 to 750 rpm is closer to spec.
Old 06-16-2018, 10:48 AM
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Originally Posted by wallytoo
idle is too high. 650 to 750 rpm is closer to spec.
650-750 RPM while in P? It's drops to around 650-750 while in D...
Old 06-16-2018, 10:56 AM
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should be printed on the underhood decal.

in neutral, operating temp, all accessories off.
22r-te 800 rpm
22r-e 750 rpm
both from the 87 fsm.
Old 06-16-2018, 12:28 PM
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Rear brakes adjusted. E brake now only comes out 3” or so till tight vs 7-9” before which has to be a good sign.

Working on be idle and bleeding the brakes next.
Old 06-16-2018, 12:29 PM
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Originally Posted by akwheeler
Idle speed is very important also, if your idle is too high with an automatic tranny it will be trying pretty hard to keep pushing you. The trans doesn't do anything different when you push the brakes, only when you let off the throttle.
You could try shifting to neutral and see how much difference there is in braking.
Yes, much easier to brake in N. Adjusting the idle now.
Old 06-16-2018, 12:34 PM
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Originally Posted by wallytoo
should be printed on the underhood decal.

in neutral, operating temp, all accessories off.
22r-te 800 rpm
22r-e 750 rpm
both from the 87 fsm.
Yeah, I’m at 1,100 RPM at the conditions above.

Working to adjust the correct adjuster screw now.

Last edited by Charles4x4; 06-16-2018 at 12:50 PM.
Old 06-16-2018, 01:21 PM
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Your rear passenger brakes look wet.

Is that entirely caused by you cleaning them?

Is there a leak (either brake fluid or axle gear oil)?

Old 06-16-2018, 01:24 PM
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Originally Posted by old87yota
Your rear passenger brakes look wet.

Is that entirely caused by you cleaning them?

Is there a leak (either brake fluid or axle gear oil)?

yup. if not from cleaning, that's one source of your brake problem.
Old 06-16-2018, 01:29 PM
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I suspect that 90% of your problem is from the idle being too high, the rear brakes out of adjustment and possibly some air in the lines.
But, your rear brakes need to be clean and dry also. if you have a rear axle seal leaking you should be planning to fix it soon. if it is brake fluid you need to fix that now.
no matter how hard you try you can never clean all of the oil out of brake shoes after they have been soaked. more will just leech out when they get hot.
Old 06-16-2018, 01:30 PM
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Originally Posted by old87yota
Your rear passenger brakes look wet.

Is that entirely caused by you cleaning them?

Is there a leak (either brake fluid or axle gear oil)?

i has just finished cleaning them. No leaks.
Old 06-16-2018, 01:31 PM
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Originally Posted by akwheeler
I suspect that 90% of your problem is from the idle being too high, the rear brakes out of adjustment and possibly some air in the lines.
But, your rear brakes need to be clean and dry also. if you have a rear axle seal leaking you should be planning to fix it soon. if it is brake fluid you need to fix that now.
no matter how hard you try you can never clean all of the oil out of brake shoes after they have been soaked. more will just leech out when they get hot.
Juat drove it and brakes are a ton better. Adjusting the tears and fixing the idle helped a ton. I’ll fully test it over the coming days but we may be done!
Old 06-16-2018, 01:37 PM
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Rear drum brake adjustment can make a huge difference in how the pedal feels.

Post back to tell us if your investigating has worked!

Old 06-16-2018, 03:57 PM
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The rear passenger side cylinder looks odd compared to the drivers side or my eyes are playing tricks on me. Has it ever been replaced? Looks smaller than the driver side and the pistons are popped thru the seal. Plus the wettness could be possible leaking cylinder or axle seal.
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