1. Outline
Brake slack agents make up for wear in both the brake lining and the brake drum. A programmed slack agent wipes out the requirement for in-administration manual change.
Any fitting, upkeep, or appraisal ought to be done exclusively by appropriately prepared and equipped experts. Assuming in any uncertainty you ought to allude to the part producer for more data. It's especially vital to adhere to producer's directions during the establishment interaction.
2. Vehicles that require programmed slack agents
Programmed slack agents should be fitted to:
engine vehicles initially utilized from 1 April 1995
trailers fabricated from 1 April 1995
Programmed slack agents needn't bother with to be fitted to trailers authorized in Ireland before 1 June 2011.
Programmed change in accordance with make up for wear is expected on all axles of the accompanying vehicles:
transports and mentors with in excess of 8 front seats
weighty products vehicles
trailers over 3.5 tons
3. Kinds of programmed slack agent
There are 2 kinds of programmed slack agent:
leeway detecting
stroke detecting
It's vital to perceive the kind of programmed slack agent that you are managing, as they are introduced and kept up with in an unexpected way. As displayed in the photos underneath, Automatic Slack Adjusters it may not be quickly clear which sort of agent you are managing.
3.1 Leeway detecting agents
Leeway detecting agents work by keeping an ostensible separation or freedom between the brake lining and the drum.
Leeway detecting agents made by Haldex and Bendix.
3.2 Stroke detecting agents
Stroke detecting agents work by keeping a steady ideal stroke of the brake actuator or chamber pushrod.
Stroke detecting agents fabricated by BPW and Meritor.
On the off chance that your programmed slack agent just works by manual change, it isn't working as a programmed slack agent and won't conform to the prerequisites.
4. Keeping up with your programmed slack agents
Programmed slack agents are liable to wear, so you ought to check them routinely and supplant them when essential.
4.1 Standard checks
During each support examination, you ought to check:
brake actuator travel
control arm and section condition
free development and return
wear and end float
oil
4.2 Checking brake actuator travel
Check the brake actuator push bar stroke to check whether it's inside the producer's suggested resistance. Utilize a ruler or measuring tape to quantify the separation from the front of the actuator to a point on the leeway agent push bar.
As a harsh aide, the stroke shouldn't surpass 2 thirds of the most extreme stroke of the actuator when the help brake is completely applied.
Most extreme stroke not entirely settled by the size of the brake chamber. A regular Sort 30 brake actuator will have a most extreme working stroke of roughly 50mm, Lideli Slack Adjusters while a common Kind 24 brake actuator will have a greatest working stroke of around 45mm. Actually look at the maker's data to affirm.
On the off chance that it's not inside resilience, the programmed slack agent might be inaccurately set up, failing, or there might be an issue with other related brake parts.
Assuming that the actuator push pole travel is inside resilience, you shouldn't physically change the brake.
4.3 Checking the state of the control arm and section
Check the control arm section and burdens (if fitted) for:
breaks
bowing
broken bolts
These may demonstrate that the agent has either been erroneously fitted or the camshaft bearing is worn.
4.4 Checking with the expectation of complimentary development and return
Make sure that the agent has free development and returns completely with no fouling. On the off chance that the agent doesn't return completely, programmed change won't occur.
4.5 Checking for end float and wear
Check assuming the camshaft is moving the long way, (this is called 'end float'), and for any wear - both ought to be insignificant.
You ought to do a visual check to check in the event that float or wear is unreasonable. In the event that you really do have to quantify, utilize a dial test marker check or sensor cutting edges. End float ought not be more than 0.5mm.
4.6 Greasing up the leeway agent
Oil the leeway agent until clean oil is radiated (except if it is of the fixed sort) and grease up the clevis pin while guaranteeing that it moves openly inside the burden.
4.7 Yearly checks
Every year, you ought to check:
the state of the instrument
the activity of the instrument
last reset
4.8 Really looking at the state of the system
Loosen off the change screw with a force wrench.
The unit ought to be supplanted if:
the force expected to do this is under 18 Nm (this setting might change relying upon the producer)
you don't hear any clicking
Some changing screws incorporate a coupling sleeve, Manual Slack Adjusters which you should keep discouraged by utilizing the spanner or attachment during pivot. You can harm inner parts on the off chance that you don't do this. There's no force setting for this kind of changing screw, and you will not hear any clicking.
4.9 Actually taking a look at the activity of the instrument
Utilize a spanner to loosen off the change screw 3 fourth of a turn.
Leave a spanner on the unit and by the same token:
apply the brakes multiple times
move the agent physically multiple times
Notice the clockwise development of the spanner with each stroke until no further change happens.
4.10 Doing a last reset
Do a last reset of the brake by fixing the change screw until the brake shoes contact the drum and afterward loosen off by a half to 3 fourth of a turn - check with the maker for the specific sum.
Instructions to do a last reset.
There should be some 'free travel' of the stroke when the brake is physically applied to allow programmed change. This ought not be in excess of 33% of the greatest stroke of the actuator.
A few makers don't suggest the last reset of the brake by this strategy yet rather suggest rehashed utilization of the brake until no further programmed change happens and afterward really taking a look at the free travel or the functioning stroke as proper.
The stroke ought to be equivalent on the two sides of any pivot. Assuming they require manual change, you ought to supplant them. Agents that 'over-stroke' ought to likewise be supplanted.
Defensive cap
A few makers integrate a defensive cap over the agent which must be taken out before change. This should be re-fitted after change, or impurities might enter the agent system.
5. Normal errors
There are 2 normal errors with regards to programmed slack agent support:
an absence of general oil
pointless manual change
5.1 Pointless manual change
Programmed slack agents ought to never should be physically changed in help.
Rehashed manual change can cause untimely wear of the inner parts and lead to early disappointment. Be that as it may, you could have to physically change your leeway agent when you:
introduce it
fix your brakes
perform redesign systems, for example, relines
Programmed slack agents ought not be physically changed in accordance with right unnecessary pushrod stroke.
Extreme pushrod stroke shows that there is an issue with either the programmed agent, with the establishment of the agent, or with other related brake parts, which manual change won't fix.
6. Explicit producers data
There might be different makes sure that are important for your particular model of programmed slack agent. You can get additional data about introducing and keeping up with it from the maker:
BPW
Haldex
Knorr Bremse
MEI Brakes
Meritor
WABCO
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