How long do brakes typically last?

Van · August 31, 2020, 11:53:06 AM

Cliff is there much of a difference in oil consumption between the MUI and DDEC?

luvrbus · August 31, 2020, 01:37:10 PM

Quote from: Van on August 31, 2020, 11:53:06 AM
Cliff is there much of a difference in oil consumption between the MUI and DDEC?

The DDEC's usually are better on oil consumption than a MUI engine even with the same parts but Jakes's cause increase crank pressure then more leaks and more oil consumption on both.The Jakes will leave spots on the rear and you can see the blue smoke when activated .As you know I install a lot of Jakes lol and people tell me adjust to .050 they work better I say no it is .059 with the Jake gauge after you leave adjust to what ever suits you

richard5933 · August 31, 2020, 02:11:49 PM

Quote from: luvrbus on August 31, 2020, 01:37:10 PM

The DDEC's usually are better on oil consumption than a MUI engine even with the same parts but Jakes's cause increase crank pressure then more leaks and more oil consumption on both.The Jakes will leave spots on the rear and you can see the blue smoke when activated .As you know I install a lot of Jakes lol and people tell me adjust to .050 they work better I say no it is .059 with the Jake gauge after you leave adjust to what ever suits you

I've got Jakes on an 8V71 and can confirm more spotting on the rear of the bus when they're on. No noticeable increase in oil consumption (I've actually only had to add a total of two gallons in all the time I've owned the bus, aside from oil changes.)

With the 4-speed they are moderately effective at slowing down the bus, with a noticeable stopping when they kick in. They won't bring the bus to a stop like on a new bus/truck, but they sure save having to use the service brakes as much.

lostagain · August 31, 2020, 06:26:05 PM

The Jakes on a loaded semi with modern 4 stroke don't slow you down any better than on a bus with a 2 stroke in the higher gears. You really feel them in the lower gears on either vehicle.

richard5933 · August 31, 2020, 06:44:48 PM

Quote from: lostagain on August 31, 2020, 06:26:05 PM
The Jakes on a loaded semi with modern 4 stroke don't slow you down any better than on a bus with a 2 stroke in the higher gears. You really feel them in the lower gears on either vehicle.

Maybe not all of them, but the Freightliner I was driving recently at work would bring the truck speed down pretty quickly if the engine brake lever was accidentally pushed to the third stage. The smart cruise applies the engine brakes on its own, and it will wake you up when they come on full force if you're not expecting it. I haven't driven a lot of trucks yet, but I know when I'm being thrown off my seat back.

If you want a real treat, have the service brakes self apply when some jerk cuts in too close and the collision avoidance kicks in. That'll make you pucker.

luvrbus · August 31, 2020, 06:59:30 PM

JC you need to drive my ISX 15 it has Jakes brakes I never had engine brakes that work as good as the ISX 15

lostagain · September 01, 2020, 05:38:02 AM

Clifford, next time I visit, I look forward to a test drive, lol.

I find the Jakes feel about the same in a 30,000 lb bus with a 2 stroke as they do in a loaded semi with 4 stroke (80,000 lb, or 140,000 lb for a B train).

In my MC5 with 6V92TA/HT740, I can feel them a bit in 4th gear. They really slow me down, and hold me back on a 8% grade in 3rd, and I turn them off in 2nd, unless I am going down a 10% grade. I think I remember I adjusted them at .059".

luvrbus · September 01, 2020, 06:11:21 AM

Quote from: lostagain on September 01, 2020, 05:38:02 AM
Clifford, next time I visit, I look forward to a test drive, lol.

I find the Jakes feel about the same in a 30,000 lb bus with a 2 stroke as they do in a loaded semi with 4 stroke (80,000 lb, or 140,000 lb for a B train).

In my MC5 with 6V92TA/HT740, I can feel them a bit in 4th gear. They really slow me down, and hold me back on a 8% grade in 3rd, and I turn them off in 2nd, unless I am going down a 10% grade. I think I remember I adjusted them at .059".

The jakes are tied to the cruise it only applies enough to keep your set speed and to keep the engine from turning over 2100 rpm I never touch the brake coming down from Flagstaff to Phoenix or from Golden Valley to Bullhead City,I had to watch my 8v92 on those grades I would look and the engine would be turning 2500 +rpm lol I am really starting to like these electronic controls

dtcerrato · September 01, 2020, 08:46:41 AM

As far as "How long do brakes typically last?" We are running most of the original brake blocks on our bus since 1979 purchase.
Da book specific to our bus states when center of brake block (shoe) thickness is down to 5/16" - replace them. New they are 3/4" thick.
The above only addresses brake lining thickness. There are a host of other factors as have been stated in this post that effect lining replacement.

edvanland · September 01, 2020, 09:06:17 AM

Clifford sorry to hear about Sona we are down in Cornville let me know if I can help.

TomC · September 01, 2020, 01:14:31 PM

On my 8V-71 with V730 and 4.56 rear end, my 60mph cruise is 1,900rpm. Pulling my car (34,750lbs) coming down the north bound Grapevine I-5, I have to switch from 1 to 2 Jake brake to keep up speed. If I pull the shifter down to 1, I can get partial (1 inch from the floor) acceleration torque converter lockup as low as 20mph. Good Luck, TomC