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Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing.


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Old 09-20-2021, 01:47 AM   #1
oec88
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Factory Brake Pump System - Question

I do apologize if this question has been answered before.

I would like to know of our factory brake pump system can support front 6-pistons and rear 4-pistons big brake kit.

As I see TRD is offering the same pistons setup brake kit, and I wonder if the TRD version of Toyota 86 comes with upgraded brake pump system.

Thank you for your time, I appreciate your response and advice on this.
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Old 09-20-2021, 02:52 AM   #2
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The other brake parts are oem on the TRD fitted big brake kit.

So you should be good with the same brake booster.
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Old 09-20-2021, 03:59 AM   #3
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The other brake parts are oem on the TRD fitted big brake kit.

So you should be good with the same brake booster.
Sorry, the brake booster you mention there is the brake pump system right?
I notice several terms are used differently across the region.

Local here people are saying thing like "Oh you put 6-piston BBK at the front and rear you cannot upgrade to 4-piston BBK because the brake pump does not have enough energy to perform"... That's why I look around for an answer whenever possible.
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Old 09-20-2021, 07:17 PM   #4
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We call the various parts by different names. In American English I think the "brake pump" you speak of is called the "master cylinder." It is operated by a vacuum assisted "brake booster" operated by a pushrod by the brake pedal. @Thefalls was telling you the OEM master cylinder should work with a BBK. Depending of the piston sizes in the new calipers, the brake bias may change. This depends on how much the mechanical advantage the master cylinder increases (assuming the BBK calipers have more piston area than the OEM calipers).
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Old 09-22-2021, 02:38 AM   #5
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We call the various parts by different names. In American English I think the "brake pump" you speak of is called the "master cylinder." It is operated by a vacuum assisted "brake booster" operated by a pushrod by the brake pedal. @Thefalls was telling you the OEM master cylinder should work with a BBK. Depending of the piston sizes in the new calipers, the brake bias may change. This depends on how much the mechanical advantage the master cylinder increases (assuming the BBK calipers have more piston area than the OEM calipers).
Thank you for the clarification.

I understand brake bias may change, subjecting to the caliper manufacturer. I don't often go to track so on the silly side, I am upgrading for the sake of look.

My concern was whether the Brake Master Cylinder can support 6-piston front and 4-piston rear. Where I think... it can?
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Old 09-22-2021, 11:06 PM   #6
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Thank you for the clarification.

I understand brake bias may change, subjecting to the caliper manufacturer. I don't often go to track so on the silly side, I am upgrading for the sake of look.

My concern was whether the Brake Master Cylinder can support 6-piston front and 4-piston rear. Where I think... it can?
A properly designed big brake system will have the same piston area as stock so that the stock master cylinder (brake pump) will work seamlessly with it.
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Old 10-01-2021, 09:53 AM   #7
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Piston sizing is not the only factor for fluid consumption, but if this will cover most of the situation (stiffness, pad clearance and others).

Some specific situation may have an issue (after a sharp turn as an example).

Most of OEM level BBK covers this type of situation, if safety in all situation is a primary concern, I would stick with those. If you get a aftermarket one, do some figure 8 in a empty oarking lot and do a braking in the sequence for you to have a feeling on the change.
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