Toyota bulletin T-TT-0788-25 REV1
What it saysCustomers state Parking Brake efficiency concerns. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Jan 30, 2026, received Feb 11, 2026, about the service brakes — 1 document under this number: T-TT-0788-25 Rev1. It names 2 model years (2023–2024). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
Get the next Toyota 4Runner bulletin by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCustomers state Parking Brake efficiency concerns. The conditions can include the following: • The Parking Brake Pedal feels loose or requires full depression for proper engagement. • When not fully depressed, effectiveness on steep surfaces may be reduced, allowing the vehicle to roll with transmission in Neutral. • When not fully depressed, effectiveness on steep surfaces may be reduced, allowing the vehicle to roll slightly with transmission in Park.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-TT-0788-25 Rev1 | Service bulletin | Jan 30, 2026 | 11028727 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new Toyota bulletins for the 4Runner
A weekly email, sent only in a week when Toyota files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 2 model years this bulletin names have filed 43 complaints with NHTSA since 2015. 2 of them name Service Brakes — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The 6gen 2025 4Runner brakes squeal VERY badly, to the point where it has changed my driving habits. I am concerned there is something wrong. There needs to be a TSB or a recall, it's really bad. Apparently a lot of people are also reporting that the brakes squeak really badly especially in reverse.
2024 Toyota 4Runner · Service Brakes · filed with NHTSA Jun 10, 2025 · ODI 11666170
New, strange noise started in Dec'25 (41K miles; 2yrs 9 months). No warning lights. Diagnosed as failed brake accumulator (first at an independent shop, later at the dealer). Apparently the accumulator is part of the full master cylinder assembly which must be replaced.
2023 Toyota 4Runner · Service Brakes · filed with NHTSA May 21, 2026 · ODI 11739260
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the service brakes
Source: same model, same component group8 other manufacturer communications filed against the Toyota 4Runner under the same component group (service brakes), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| T-SB-0006-26 REV2 | Service bulletin | Jul 20, 2026 | Some 2024 – 2026 model year Land Cruiser, and 2025 – 2026 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the… |
| T-SB-0006-26 REV1 | Service bulletin | May 19, 2026 | Some 2024 – 2026 model year Land Cruiser, and 2025 – 2026 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the f… |
| T-SB-0046-25 OBSOLETE | Service bulletin | Feb 12, 2026 | OBSOLETE NOTICE February 12, 2026: This bulletin is now obsolete. Please see T-SB-0006-26. |
| T-SB-0006-26 | Service bulletin | Feb 11, 2026 | Some 2024 – 2026 model year Land Cruiser, and 2025 – 2026 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the f… |
| T-SB-0046-25 REV2 | Service bulletin | Nov 19, 2025 | Some 2024 – 2026 model year Land Cruiser, and 2025 – 2026 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the f… |
| T-SB-0046-25 REV1 | Service bulletin | Sep 4, 2025 | Some 2024 – 2025 model year Land Cruiser, and 2025 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the front br… |
| T-TT-0788-25 | Service bulletin | Aug 15, 2025 | Customers state Parking Brake efficiency concerns. The conditions can include the following: • The PKB Pedal feels loose or requires full de… |
| T-SB-0046-25 | Service bulletin | Jul 24, 2025 | Some 2024 – 2025 model year Land Cruiser, and 2025 model year 4Runner and 4Runner Hybrid vehicles may exhibit a condition where the front br… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Toyota, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota T-TT-0788-25 REV1 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the T-TT-0788-25 REV1 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Toyota warranty extension on file lists the ones Toyota has filed.
Which vehicles does T-TT-0788-25 REV1 cover?
The manufacturer filed it against 2 model years: 2024 Toyota 4Runner, 2023 Toyota 4Runner. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.