Reply
 
Thread Tools Display Modes
 
Old 09-22-2016, 09:25 PM   #1
New Member
 
Join Date: Sep 2016
Location: Milwaukee
Posts: 7
Hydraulic or Air Brakes?

Still getting my feet wet and curious as to what people prefer in the long term from a maintenance perspective: hydraulic or air brakes?
J3PO is offline   Reply With Quote
Old 09-22-2016, 09:33 PM   #2
Bus Nut
 
oricha1984's Avatar
 
Join Date: Jul 2016
Location: Central Florida
Posts: 513
Chassis: GMC or Chevrolet, I hope
Engine: gasser probably
I'm a new noob here, but from what I've read. Air >hydraulic

Sent from my BLU LIFE ONE X using Tapatalk
__________________
the more i learn, the less I know what to buy . . .
oricha1984 is offline   Reply With Quote
Old 09-22-2016, 09:37 PM   #3
Skoolie
 
NowhereFast's Avatar
 
Join Date: Mar 2016
Location: Sarasota, Florida
Posts: 171
Year: 1995
Coachwork: International
Chassis: Carpenter
Engine: d466 mechanical
There's a reason big rigs have air brakes!
__________________
Nowhere Fast - Sarasota, Florida
NowhereFast is offline   Reply With Quote
Old 09-22-2016, 09:42 PM   #4
New Member
 
Join Date: Sep 2016
Location: Milwaukee
Posts: 7
Quote:
Originally Posted by NowhereFast View Post
There's a reason big rigs have air brakes!
Touché - thank you
J3PO is offline   Reply With Quote
Old 09-22-2016, 09:45 PM   #5
Bus Nut
 
Tootalltechie's Avatar
 
Join Date: Jul 2016
Location: Prince George, BC, Canada
Posts: 427
Year: 1974
Coachwork: Bluebird
Chassis: CHEVROLET C60 just under 19700 lbs body#B10353
Engine: 350 ci on propane
Rated Cap: 48
Where I live (BC Canada) need a special addition to my license for air brakes so I went with hydraulic brakes on my bus.

Sent from my SM-G530W using Tapatalk
Tootalltechie is online now   Reply With Quote
Old 09-23-2016, 12:50 AM   #6
Almost There
 
Join Date: Jan 2016
Location: Greater Boston
Posts: 81
Don't automatically be fooled by big-rigs use of air brakes. There are plenty of pros and cons about the systems.

Air brakes were first used on trains (in part because trains were designed/constructed first.) Air is used because it's many things - but not not exactly because it's best. The biggest thing about it is that it's free - it's everywhere. If it leaks, no problem - you can get more! You don't need to clean it up if it "spills." It has little weight to it, and it's fairly easy to filter out contaminants (like water.)

Many of the same things can still be said about trucks and trailers - you pick up a trailer that's been sitting around a few weeks, and you just fill the air tank back up again, and away you go. But air is picky - it needs to be dry, if you get water in the system, you can get ice, and things will freeze up.

Air has one BIG advantage - the first brakes were manual - no power assist. That was okay for something like a car. For a truck, you need a bit more force. So you have power-assist brakes - which use engine power to assist your stopping power (vacuum, or hydraulic.) That's great - IF the engine is running. If the engine stops, your power assist goes away - and so do your brakes. The tank of pressurized air sitting under the truck cab doesn't care if the engine is running or not. You've got a fairly long time to get the truck stopped, using the stored compressed air.


What still matters in the end is the ability of the brake system to dissipate the heat generated from friction to stop the vehicle - whatever generates the pressure is secondary.

I mean, we use both pressure systems all the time - air-powered jackhammers and tools, but hydraulic excavators and tractors.
Mark_In_MA is offline   Reply With Quote
Old 09-23-2016, 07:00 AM   #7
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,117
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
I'll tell you soon.. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both!

-Christopher
cadillackid is online now   Reply With Quote
Old 10-03-2016, 03:22 PM   #8
New Member
 
Join Date: Oct 2016
Posts: 3
Quote:
Originally Posted by cadillackid View Post
I'll tell you soon.. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both!

-Christopher
Any word on your findings?
tad875 is offline   Reply With Quote
Old 10-03-2016, 07:54 PM   #9
New Member
 
Join Date: Sep 2016
Location: Milwaukee
Posts: 7
Quote:
Originally Posted by cadillackid View Post
I'll tell you soon.. I have a bus with air brakes and just bought one with hydraulics so i'll soon know the pros and cons of both!

-Christopher
Very interested to hear!
J3PO is offline   Reply With Quote
Old 10-03-2016, 09:17 PM   #10
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,117
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
I drove both busses one right after the other...
1. AIR Brake - in a hard stop scenerio I can get from seeing the need to stop to braking going to the wheels faster with the air brakes.. maybe 1/2 second to maybe 3/4 second. but thats the difference sometimes in crash vs stop..

2. HYDRAULIC -that good familiar feel of regular car brakes.. more pedal travel... easing into the pedal.. unlike air brakes where you have very little travel... so with hydro you have that car feel.

3. AIR BRAKE - Precise control in slick conditions.. - this one from a situation a few weeks ago where a car pulled in front of me in the rain... it was Very easy to feather the pedal in and out quite quickly to pulse the rear wheels so they didnt stay Locked up... with hydraulic the long slower pedal travel would not allow for pumping.. of course with the air theres the chance you will outpump the compressor and run the pressure low.. but I still had 75 PSI at the end of that stop.. and my bus didnt go sideways in the rain..

4. AIR BRAKE - Failsafe. with an air brake you have an extra braking system that is not present on hydraulic.. that is your rear spring brakes which apply during loss of air pressure... they are REAL brakes.. that also act as a parking brake so 4 wheels in the back t hold it stopped when parked. with hydraulic you often have a single brake on the driveshaft.. which would be tugh to stop a bus in a failure but is fine as a parking brake.

5. Hydraulic brake - ease of repair... typically 2 or 4 wheel disc very similar to car brakes.. so you can likely fix most things on them yourself, or a normal car shop with a big bay can work on them... whereas air brakes take specialized tools and specialized knowledge only big-rig ($$$) shops have..

6. Air Brakes - They just plain Sound Bad-Ass!!

-Christopher
cadillackid is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:53 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.