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Brakes > Brakes > Flashcards

Brakes Flashcards

1
Q

What do manual brake systems rely on?

A

A keep full reservoir

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2
Q

What was the keep full reservoir replenished by?

A

A small orifice that was connected to either the lube circuit on open station tractor or the steering return circuit on sound guard body’s

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3
Q

What was the keep full reservoir replenished by?

A

A small orifice that was connected to either the lube circuit on open station tractor or the steering return circuit on sound guard body’s

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4
Q

What was a larger reservoir in the system for?

A

To maintain the oil level of the keep full and ensure no back pressure

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5
Q

What was a larger reservoir in the system for?

A

To maintain the oil level of the keep full and ensure no back pressure

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6
Q

What is the approximate mechanical advantage ratio of the manual braking system?

A

6 : 1

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7
Q

What is the purpose of the equalizer check in the manual brake system?

A

To allow the brake pressure to be felt at the opposite side equalizer check

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8
Q

When the operator releases the pedal, where does the oil flow on the manual brake system?

A

Oil returns from the brake piston through the residual check valve orifice slowing the flow of oil to prevent air entry past the brake piston seals

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9
Q

For proper pedal adjustment, what must be done before adjusting the pedal stop?

A

The brake system must be bled

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10
Q

What must you remember when applying pressure to the brake pedal when adjusting?

A

Always apply the force to the opposite pedal from the one you are adjusting the stop for

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11
Q

What is the spec for pedal drop when adjusting?

A

Each pedal should not drop over 1 inch in 1 minute with 60 pounds of pedal effort

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12
Q

What would be the problem if you had poor braking action/noise with a solid pedal feel?

A

The failure of the friction material of the brake disc

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13
Q

What would be the cause for the brake pedals to settle during application?

A

External leakage from lines and fittings or internal leakage at the axle or brake valves

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14
Q

To isolate the brake valve assembly from the axle, what must you do?

A

Disconnect the brake lines and cap off the fittings on the outlet side of the brake valve

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15
Q

What will this do for diagnosing a leak?

A

If when applying the pedals they always remain solid with no settling the problem is in the brake piston area of the rear axle

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16
Q

What type of brake valve does the 6000 series tractors use?

A

Manual hydraulic brake valve

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17
Q

What is the main purpose or biggest advantage of the manual hydraulic brake valve?

A

Provides several stages of operation to provide quick application and yet high capacity braking action without a large amount of pedal travel

18
Q

What is the starting psi in the manual hydraulic brake valve?

A

Approximately 85 psi and is providing a quick fill of the brake piston chamber

19
Q

When a single pedal is actuated, the large and small pistons are moved inwards together causing what?

A

The inlet valve is closed by movement of the small piston and equalizing valve is pushed open

20
Q

How much psi does it take to overcome the piston, retractors and sealed drag to move the piston to take up the clearance?

A

44 psi

21
Q

On the manual hydraulic brake valve at what psi does the low pressure regulator cone get pushed off its seat?

A
  1. Psi
22
Q

At which psi will the pressure overcome the regulator plunger, large spring on the manual hydraulic brake valve?

A

Between 145 and 365 psi

23
Q

On the manual hydraulic brake valve what is the spec for pedal play?

A

Must be between 0.15 and 0.20 mm or .006 - .008”

24
Q

What is extremely important when adjusting the pedal adjustment?

A

Make sure both pedals are locked together

25
Q

What is very important when bleeding breaks on a 6400 tractor?

A

Be sure to turn the steering wheel slowly and evenly otherwise, the oil in the reservoir may turn to foam and cause air to get into the brake system

26
Q

What psi does the Waterloo brake system use to actuate the brake pistons for power brakes?

A

2500 psi

27
Q

When does the equalizer valve open on Waterloo power brakes?

A

The operating guide contacts equalizing valve pin, which opens the equalizer valve before opening the break valve

28
Q

On the Waterloo power brake system what is inside the brake accumulators?

A

Dry nitrogen - no oxygen

29
Q

What psi are the brake accumulators pressurized to?

A

475 to 525 psi

30
Q

When bleeding the Waterloo brake system how far should you open the bleed screw?

A

2 turns

31
Q

When you’re bleeding the Waterloo brake system how should the pedal feel when bleeding is completed?

A

Pedal should feel solid and travel should not exceed 3 inches

32
Q

How do you test the brake accumulators?

A

Apply both brake pedals five times in 5 second intervals with engine stopped for no less than 15 minutes - Bleed brakes and retest accumulator, if breaks feel spongy retest accumulator - If problem still occurs there is a malfunction in accumulator or brake system

33
Q

What psi do 7420 power hydraulic brakes operate at?

A

1150 psi

34
Q

How does load sense isolation work on 7420 hydraulic brakes?

A

As long as the hydraulic pump is running and adequate standby pressure is available, piston will be pushed up on the load sense check valve mechanically

35
Q

At what psi does the pressure limiting valve limit the system to?

A

1150 psi

36
Q

Why is the 7420 pressure limiting very useful?

A

It reduces stress on components, such as brake lines and seals

37
Q

What are brake retractors used for?

A

To ensure that the brakes do not drag, they pull the piston or brake application plate away from the linings

38
Q

Is it OK to install the rear brakes and pistons without a manual?

A

No, it is important that you must follow the recommended procedure for installation of the rear brakes, retractors and pistons

39
Q

On the Cessna power brakes what psi is regulated to the brake system?

A

The MCV pump regulates approximately 260 psi to the Cessna power brakes

40
Q

How does emergency braking work on the Cessna power brakes?

A

When there is no fall from the MCV circuit and a break is applied the brake inlet check is seated and movement of the small piston into the large piston traps oil in the brake circuit

41
Q

How much flow is a approximately supplied to the Cessna power brakes?

A

The supply line to the valve contains an orifice which limits the flow to 1 gallon per minute

Brakes (1 decks)

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